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{{infobox Disease
{{infobox Disease
|Title              =  
|Title              = Jackson Syndrome
|Aliases            =  
|Aliases            = Vagal-Accessory-Hypoglossal Syndrome, Hughlings Jackson Syndrome
|Image              =  
|Image              =
|Caption            =  
|Caption            =
|ICD-9              =  
|ICD-9              = 352.6
|ICD-10            =  
|ICD-10            = G52.7
|MeSH              =  
|MeSH              =
|Gene              =  
|Gene              =
|Locus              =  
|Locus              =
|OMIM              =  
|OMIM              =
|EyeWiki            =  
|EyeWiki            =
|Radiopaedia        =  
|Radiopaedia        =
|Symptoms          = Dysphagia, dysarthria, hoarseness, tongue deviation, shoulder weakness
|Complications      = Aspiration pneumonia, malnutrition, communication disability
|Onset              = Acute (vascular) or progressive (neoplastic)
|Duration          = Variable; depends on etiology
|Causes            = Medullary infarction, ICA dissection, brainstem tumors, demyelination
|Risk_factors      = Hypertension, diabetes, vertebral artery disease, skull base tumors
|Diagnosis          = Clinical examination; MRI brain with contrast; MRA/CTA for vascular causes
|Differential      = Wallenberg syndrome, Dejerine syndrome, Collet-Sicard syndrome, Villaret syndrome
|Treatment          = Etiologic treatment; dysphagia therapy; voice rehabilitation; aspiration precautions
|Prognosis          = Peripheral palsies: good recovery; Central palsies: limited recovery
}}
}}
# Jackson Syndrome


== Overview ==
== Overview ==
'''Jackson syndrome''' is a rare '''medullary (brainstem) syndrome''' characterized by dysfunction of [[cranial nerve X]] (vagus), [[cranial nerve XI]] (accessory), and [[cranial nerve XII]] (hypoglossal), resulting from lesions affecting the [[nucleus ambiguus]] and [[hypoglossal nucleus]] region in the ventrolateral medulla oblongata.<ref name="Pearce2007">Pearce JM. Hughlings Jackson and the medullary syndromes. ''J Neurol Neurosurg Psychiatry''. 2007;78(1):1. doi:10.1136/jnnp.2006.106245</ref><ref name="Ropper2019">Ropper AH, Samuels MA, Klein JP, Prasad S. ''Adams and Victor's Principles of Neurology''. 11th ed. McGraw-Hill; 2019. pp. 796-797.</ref>
The syndrome produces ipsilateral [[paralysis]] of the soft palate, larynx, [[sternocleidomastoid muscle|sternocleidomastoid]], [[trapezius]], and [[tongue]].<ref name="Ropper2019"/>
'''Critical anatomical distinction''': Jackson syndrome is specifically a '''central (medullary) syndrome''', distinguishing it from the '''peripheral skull base syndromes''' (Vernet, Collet-Sicard, Villaret) which involve the same cranial nerves but at different anatomical locations (jugular foramen, hypoglossal canal, retroparotid space).<ref name="ACR2022">Expert Panel on Neurological Imaging, Rath TJ, Policeni B, et al. ACR Appropriateness Criteria® Cranial Neuropathy: 2022 Update. ''J Am Coll Radiol''. 2022;19(11S):S263-S285. doi:10.1016/j.jacr.2022.09.002</ref> This distinction has '''critical prognostic implications''': peripheral cranial nerve palsies mostly resolve completely over time, while central palsies from brainstem stroke typically do not.<ref name="Dejakum2023">Dejakum B, Kiechl S, Knoflach M, Mayer-Suess L. A narrative review on cervical artery dissection-related cranial nerve palsies. ''Front Neurol''. 2023;14:1227484. doi:10.3389/fneur.2023.1227484</ref>
=== History ===
=== History ===
[[John Hughlings Jackson]] (1835-1911) was one of the founding fathers of British neurology and worked primarily at the National Hospital for the Paralysed and Epileptic at Queen Square, London. He made seminal contributions to understanding [[epilepsy]], [[aphasia]], and the hierarchical organization of the nervous system.<ref name="York2011">York GK, Steinberg DA. Hughlings Jackson's neurological ideas. ''Brain''. 2011;134(Pt 10):3106-3113. doi:10.1093/brain/awr219</ref>
Jackson first reported the syndrome in 1864, and described a further case caused by medullary hemorrhage in 1872 with [[hypoglossal nerve]] palsy and incomplete vagal paresis. His work was part of a broader 19th-century effort to map [[brainstem]] syndromes to specific anatomical locations. Other medullary syndromes described during this era include [[Wallenberg syndrome]] (lateral medullary), [[Dejerine syndrome]] (medial medullary), and Avellis syndrome (vagus and spinothalamic tract).<ref name="York2011"/>


== Pathophysiology ==
== Pathophysiology ==
=== Relevant Anatomy ===
=== Relevant Anatomy ===
'''Medullary nuclei involved''':<ref name="Ropper2019"/><ref name="Sciacca2019">Sciacca S, Lynch J, Davagnanam I, Barker R. Midbrain, pons, and medulla: Anatomy and syndromes. ''Radiographics''. 2019;39(4):1110-1125. doi:10.1148/rg.2019180126</ref>
'''Nucleus ambiguus''':
* Motor nucleus for [[cranial nerve IX]], [[cranial nerve X]], [[cranial nerve XI]] (cranial portion)
* Located in ventrolateral medulla
* Provides motor innervation to:
** Pharyngeal constrictors
** Soft palate ([[levator veli palatini]])
** Laryngeal muscles (via [[recurrent laryngeal nerve]])
** Upper esophagus
'''Hypoglossal nucleus''':
* Located in dorsomedial medulla near floor of fourth ventricle
* Provides motor innervation to all intrinsic and most extrinsic [[tongue]] muscles
* Forms hypoglossal triangle in floor of fourth ventricle
* '''Hypoglossal involvement is a key distinguishing feature''' separating hemimedullary (Reinhold) syndrome from Babinski-Nageotte syndrome<ref name="Krasnianski2003">Krasnianski M, Neudecker S, Schluter A, Zierz S. Babinski-Nageotte's syndrome and hemimedullary (Reinhold's) syndrome are clinically and morphologically distinct conditions. ''J Neurol''. 2003;250(8):938-942. doi:10.1007/s00415-003-1115-1</ref>
'''Spinal accessory nucleus''':
* Extends from C1-C5 spinal segments
* Cranial portion contributes to [[cranial nerve XI]]
* Innervates [[sternocleidomastoid muscle]] and [[trapezius]]
'''Vascular supply''':
* '''[[Anterior spinal artery]]''': Supplies medial medulla including hypoglossal nucleus
* '''[[Posterior inferior cerebellar artery]] (PICA)''': Supplies lateral medulla
* '''[[Vertebral artery]]''': Direct branches to ventral medulla
=== Disease Etiology ===
=== Disease Etiology ===
'''Causes of Jackson syndrome''':<ref name="Ropper2019"/><ref name="ACR2022"/>
'''Vascular''' (most common):
* [[Vertebral artery]] occlusion or dissection
* [[Anterior spinal artery]] occlusion
* [[Brainstem]] infarction
* [[Hemorrhage]]
'''Internal carotid artery dissection''' (important underrecognized cause):<ref name="Dejakum2023"/><ref name="English2018">English SW, Passe TJ, Lindell EP, Klaas JP. Multiple cranial neuropathies as a presentation of spontaneous internal carotid artery dissection: A case report and literature review. ''J Clin Neurosci''. 2018;50:129-131. doi:10.1016/j.jocn.2018.01.049</ref><ref name="Mokri1996">Mokri B, Silbert PL, Schievink WI, Piepgras DG. Cranial nerve palsy in spontaneous dissection of the extracranial internal carotid artery. ''Neurology''. 1996;46(2):356-359. doi:10.1212/WNL.46.2.356</ref>
* Cranial nerve palsy occurs in '''approximately 10%''' of spontaneous cervical artery dissections
* '''Mechanism differs by dissection type''':
** ''Steno-occlusive dissections'' (proximal ICA): Cause CN II, III, VII palsies via hypoperfusion/microembolism
** ''Expansive dissections'' (distal ICA): Cause CN IX, X, XI, XII palsies via local mass effect from pseudoaneurysm formation
* '''Critical clinical point''': Peripheral palsies from dissection mostly resolve completely; central palsies from brainstem stroke do not—making cerebrovascular imaging essential for prognosis
'''COVID-19/ICU-related''' (emerging cause):<ref name="Decavel2021">Decavel P, Nahmias O, Petit C, Tatu L. Lower cranial nerve palsies in the COVID-19 pandemic: A 10-case series of intensive care unit patients. ''Eur Neurol''. 2021;84(4):252-258. doi:10.1159/000515181</ref>
* 11% of ICU patients (10/88) developed lower cranial nerve palsies after severe COVID-19
* Hypoglossal nerve palsy most common (9/10 patients)
* Mechanism: Mechanical compression from prone-position ventilation therapy
* Most patients recovered within one month
'''Neoplastic''':
* Brainstem [[glioma]]
* Metastatic disease
* [[Meningioma]] of [[foramen magnum]]
* [[Skull base]] tumors ([[chordoma]], [[chondrosarcoma]])
* [[Jugular foramen]] tumors
'''Demyelinating''':
* [[Multiple sclerosis]]
* [[Acute disseminated encephalomyelitis]] (ADEM)
'''Infectious/Inflammatory''':
* Brainstem [[encephalitis]]
* [[Tuberculosis]]
* [[Sarcoidosis]]
* [[Neurosyphilis]]
'''Traumatic''':
* [[Skull base]] fractures (atlas or condylar fractures)
* Penetrating trauma
'''Congenital''':
* [[Arnold-Chiari malformation]]
* [[Syringobulbia]]
=== Genetics ===
=== Genetics ===
No genetic predisposition specific to Jackson syndrome; underlying conditions (e.g., connective tissue disorders predisposing to dissection, familial tumor syndromes) may have genetic components.
=== Histology ===
=== Histology ===
Histological findings depend on etiology:
* '''Vascular''': Infarction, gliosis, neuronal loss in affected nuclei
* '''Neoplastic''': Tumor-specific histology
* '''Demyelinating''': Demyelinated plaques, inflammation


== Diagnosis ==
== Diagnosis ==
=== Patient History ===
=== Patient History ===
'''Presenting symptoms''' reflect involvement of CN X, XI, and XII:<ref name="Ropper2019"/>
'''Swallowing difficulties ([[dysphagia]])''':
* Difficulty with bolus control
* Nasal regurgitation
* [[Aspiration]]
* Coughing/choking with meals
'''Voice changes''':
* Hoarseness or breathy voice
* [[Diplophonia]]
* Reduced vocal projection
'''Speech difficulties ([[dysarthria]])''':
* Slurred speech
* Difficulty with lingual consonants
* Nasal speech quality
'''Neck/shoulder weakness''':
* Difficulty turning head
* Shoulder drop
* Arm elevation weakness
'''Associated symptoms''' (depending on lesion extent):
* Headache (if vascular or mass lesion)
* Vertigo
* [[Ataxia]]
* Contralateral sensory loss (if long tracts involved)
=== Physical Examination ===
=== Physical Examination ===
'''Cranial nerve X examination''':
* '''Palate''': Ipsilateral palate droop, [[uvula]] deviation to contralateral side
* '''Gag reflex''': Diminished on affected side
* '''Voice''': Hoarseness, breathiness
'''Cranial nerve XI examination''':
* '''[[Sternocleidomastoid muscle|Sternocleidomastoid]]''': Weakness turning head to contralateral side
* '''[[Trapezius]]''': Shoulder droop, weakness of shoulder shrug
* [[Atrophy]] may be present in chronic cases
'''Cranial nerve XII examination''':
* '''[[Tongue]] at rest''': May show [[fasciculations]] (LMN lesion)
* '''[[Tongue]] protrusion''': Deviates toward affected side
* '''[[Tongue]] bulk''': Ipsilateral atrophy in chronic cases
* Difficulty with rapid alternating tongue movements
'''[[Laryngoscopy]] findings''':
* Ipsilateral [[vocal fold]] paralysis
* Pooling of secretions
* Reduced palatal elevation
=== Laboratory Tests ===
=== Laboratory Tests ===
=== Imaging ===
 
Laboratory evaluation focuses on underlying etiology:
* '''Complete blood count''': [[Infection]], [[malignancy]]
* '''[[ESR]]/[[CRP]]''': Inflammatory conditions
* '''[[Glucose]], [[lipid]] panel''': Vascular risk factors
* '''[[Coagulation]] studies''': Hypercoagulable states
* '''[[ANA]], [[ANCA]]''': [[Vasculitis]] screen
* '''[[Lumbar puncture]]''': If infection, inflammation, or [[demyelination]] suspected
 
=== Imaging: 2022 ACR Appropriateness Criteria ===
 
'''ACR Appropriateness Criteria (2022)''' provide detailed recommendations for multiple lower cranial nerve palsies:<ref name="ACR2022"/>
 
'''MRI head with contrast''' (preferred initial imaging):
* '''Indications''': Evaluating posterior skull base pathology, posterior fossa lesions, brainstem pathology, leptomeningeal processes
* '''Sequences''':
** '''DWI/ADC''': Essential for acute brainstem infarction detection (though false-negatives can occur with very small brainstem infarcts)
** '''T1 pre/post-contrast''': Mass lesions, enhancement patterns
** '''T2/FLAIR''': Demyelination, edema
** '''GRE/SWI''': Hemorrhage detection
 
'''Advanced MRI techniques''':<ref name="ACR2022"/>
* '''Thin-cut heavily T2-weighted contrast-enhanced modified balanced SSFP sequences''': Provide detailed imaging of lower cranial nerves within the jugular foramen, with '''90-100% of CN IX, X, and XII visible'''
* '''Contrast-enhanced MRA''': Evaluates relationship of nerves to vascular structures
 
'''CTA head and neck''':<ref name="ACR2022"/><ref name="English2018"/>
* '''Indication''': When internal carotid artery dissection is clinically suspected
* '''Sensitivity''': 66% for blunt carotid vascular injury (most false negatives are low-grade injuries)
* '''T1-weighted axial cervical MRI with fat-saturation''' provides highest sensitivity and specificity for dissection
 
'''Important imaging consideration''':<ref name="ACR2022"/>
Complete evaluation of CN IX, XI, and XII requires '''head and neck imaging''' since these nerves extend into the neck. For CN X, evaluation of the '''head, neck, and upper chest''' (to the aortopulmonary window) is necessary to include the recurrent laryngeal nerve.
 
=== Differential Diagnosis ===
=== Differential Diagnosis ===
There are several named syndromes differentiating the various cranial nerve deficits that can result from skull base masses and lesions. These should be considered based on cranial nerve involvement.  
 
* [[Vernet Syndrome|Vernet Syndrome]]
There are several named syndromes differentiating the various cranial nerve deficits that can result from skull base masses and lesions. These should be considered based on cranial nerve involvement.
* [[Collet-Sicard Syndrome|Collet-Sicard Syndrome]]
 
* [[Villaret Syndrome|Villaret Syndrome]]
* [[Vernet Syndrome]]
* [[Tapia Syndrome|Tapia Syndrome]]
* [[Collet-Sicard Syndrome]]
* [[Schmidt Syndrome|Schmidt Syndrome]]
* [[Villaret Syndrome]]
* [[Tapia Syndrome]]
* [[Schmidt Syndrome]]


These syndromes and their respective cranial nerve involvement are outlined in the table below.
These syndromes and their respective cranial nerve involvement are outlined in the table below.


{| class="wikitable", style="margin-left: auto; margin-right: auto; border: none; text-align: center"
{| class="wikitable" style="margin-left: auto; margin-right: auto; border: none; text-align: center"
|+ Cranial Nerve Involvement in Skull Base Masses
|+ Cranial Nerve Involvement in Skull Base Masses
|-
|-
! Syndrome !! CN IX !! CN X !! CN XI !! CN XII !! Sympathetics
! Syndrome !! CN IX !! CN X !! CN XI !! CN XII !! Sympathetics
|-
|-
| Vernet Syndrome || ✔ || ✔ || ✔ || ||  
| Vernet Syndrome || ✔ || ✔ || ✔ || ||
|-
|-
| Collet-Sicard Syndrome || ✔ || ✔ || ✔ || ✔ ||
| Collet-Sicard Syndrome || ✔ || ✔ || ✔ || ✔ ||
Line 51: Line 245:
| Tapia Syndrome || || ✔ || ± || ✔ || ±
| Tapia Syndrome || || ✔ || ± || ✔ || ±
|-
|-
| Jackson Syndrome || || ✔ || ✔ || ✔ ||  
| Jackson Syndrome || || ✔ || ✔ || ✔ ||
|-
|-
| Schmidt Syndrome || || ✔ || ✔ || ||
| Schmidt Syndrome || || ✔ || ✔ || ||
|}
|}
=== Comparison of Medullary Syndromes ===
'''Critical distinctions for medullary syndrome classification''':<ref name="Krasnianski2006">Krasnianski M, Müller T, Stock K, Zierz S. Between Wallenberg syndrome and hemimedullary lesion: Cestan-Chenais and Babinski-Nageotte syndromes in medullary infarctions. ''J Neurol''. 2006;253(5):644-648. doi:10.1007/s00415-006-0025-3</ref><ref name="Krasnianski2003"/><ref name="Sciacca2019"/>
{| class="wikitable"
! Syndrome !! Cranial Nerves !! Key Features !! Lesion Location
|-
| '''Wallenberg''' (lateral medullary) || V, VIII, IX, X || Horner syndrome, ataxia, crossed sensory loss || Lateral medulla (PICA territory)
|-
| '''Dejerine''' (medial medullary) || XII || Contralateral hemiparesis, deep sensory loss || Medial medulla (ASA territory)
|-
| '''Jackson''' || X, XI, XII || '''No long tract signs''' || Ventrolateral medulla
|-
| '''Babinski-Nageotte''' || Wallenberg + contralateral hemiparesis || All Wallenberg features + pyramidal signs; '''NO hypoglossal palsy''' || Intermediolateral medulla
|-
| '''Hemimedullary (Reinhold)''' || XII + Wallenberg features || '''Hypoglossal palsy is invariable''' || Complete hemimedulla
|-
| '''Avellis''' || X || Spinothalamic involvement (crossed sensory loss) || Nucleus ambiguus + spinothalamic tract
|}
'''Critical distinction''': Babinski-Nageotte syndrome is '''NOT identical''' to hemimedullary syndrome—hypoglossal palsy is not part of Babinski-Nageotte syndrome but is invariable in hemimedullary (Reinhold) syndrome.<ref name="Krasnianski2003"/>


== Management ==
== Management ==
=== Medical Management ===
=== Medical Management ===
Treatment focuses on underlying etiology and supportive care:<ref name="Ropper2019"/>
'''Etiologic treatment''':
* '''[[Stroke]]''': Antiplatelet therapy, [[statin]], [[blood pressure]] management, stroke [[rehabilitation]]
* '''Dissection''': Anticoagulation or antiplatelet therapy; surgical/endovascular intervention if indicated
* '''Demyelinating disease''': [[Corticosteroid]]s, disease-modifying therapy
* '''[[Infection]]''': Appropriate antimicrobial therapy
* '''[[Vasculitis]]''': [[Immunosuppression]]
=== Dysphagia Management: Evidence-Based Rehabilitation ===
'''Instrumental evaluation is essential''':<ref name="AHA2016">Winstein CJ, Stein J, Arena R, et al. Guidelines for adult stroke rehabilitation and recovery: A guideline for healthcare professionals from the American Heart Association/American Stroke Association. ''Stroke''. 2016;47(6):e98-e169. doi:10.1161/STR.0000000000000098</ref>
* Videofluoroscopy or FEES is necessary to visualize swallow physiology and determine presence/absence of aspiration
* '''Bedside evaluation alone cannot predict aspiration'''—patients can aspirate without overt clinical signs
'''Behavioral therapy protocols with evidence''' (2024 Lancet Neurology review):<ref name="Labeit2024">Labeit B, Michou E, Trapl-Grundschober M, et al. Dysphagia after stroke: Research advances in treatment interventions. ''Lancet Neurol''. 2024;23(4):418-428. doi:10.1016/S1474-4422(24)00053-3</ref>
'''Chin-tuck against resistance (CTAR)''':<ref name="Labeit2024"/><ref name="VA2024">Department of Veterans Affairs. Management of stroke rehabilitation (2024). ''VA/DoD Clinical Practice Guidelines''. 2024.</ref>
* Meta-analysis of 8 RCTs showed improvements in swallowing safety and oral intake
* '''More effective than Shaker exercises'''
* Decreased aspiration in patients with post-stroke dysphagia
'''Shaker exercises''':
* Head-lifting exercise to increase laryngeal elevation and upper esophageal sphincter opening
* RCT showed improvement in penetration-aspiration scale
'''Expiratory muscle strength training (EMST)''':<ref name="Labeit2024"/>
* Reduces penetrations/aspirations and improves oral intake
'''Neurostimulation approaches''':<ref name="Labeit2024"/>
* Transcranial direct current stimulation (tDCS) and repetitive transcranial magnetic stimulation (rTMS): Promising results for promoting neuroplasticity
* Pharyngeal electrical stimulation: Emerging evidence
* However, high-quality studies showing effects on pneumonia, functional outcome, or mortality are scarce
'''Timing of interventions''':<ref name="Labeit2024"/>
* '''Acute phase''': Focus on complication prevention; enteral nutrition via nasogastric tube if needed
* '''Post-acute/chronic phase''': All dysphagia therapies including restitutive measures; PEG for chronic dysphagia
'''Aspiration risk stratification''':<ref name="Kim2000">Kim H, Chung CS, Lee KH, Robbins J. Aspiration subsequent to a pure medullary infarction: Lesion sites, clinical variables, and outcome. ''Arch Neurol''. 2000;57(4):478-483. doi:10.1001/archneur.57.4.478</ref>
* Aspiration occurrence depends critically on lesion location
* '''Middle-level lesions, particularly those that are inferior-dorsolateral, are most strongly associated with aspiration'''
=== Voice Rehabilitation ===
* Speech therapy for [[dysarthria]]
* Vocal exercises
* Lee Silverman Voice Treatment (LSVT) for reduced loudness
=== Surgical Management ===
=== Surgical Management ===
'''Surgical intervention depends on etiology''':
'''Tumor resection''':
* [[Skull base]] approaches for accessible lesions
* Debulking for non-resectable tumors
'''Vascular intervention''':
* [[Vertebral artery]] stenting or bypass (select cases)
* [[Aneurysm]] treatment if present
'''Vocal fold medialization''' (for persistent vocal fold paralysis):
* [[Injection laryngoplasty]] (temporary or permanent)
* [[Thyroplasty]] type I
'''Palatal surgery''':
* Palatal lift prosthesis
* Palatopharyngeal surgery (rarely indicated)


== Outcomes ==
== Outcomes ==
=== Complications ===
=== Complications ===
* '''[[Aspiration pneumonia]]''': Major cause of morbidity
* '''[[Malnutrition]]/[[Dehydration]]''': From [[dysphagia]]
* '''Communication disability''': From [[dysarthria]]
* '''Reduced quality of life''': Functional limitations
* '''Progression''': Depends on underlying etiology
=== Prognosis ===
=== Prognosis ===
'''Critical prognostic distinction: Peripheral vs Central Palsies''':<ref name="Dejakum2023"/>
* '''Peripheral palsies''' (from dissection, compression): '''Mostly resolve completely over time'''
* '''Central palsies''' (from brainstem stroke): '''Do not typically resolve'''
* This distinction is critical for patient counseling
'''Post-stroke recovery patterns''':<ref name="Jorgensen1999">Jørgensen HS, Nakayama H, Raaschou HO, Olsen TS. Stroke: Neurologic and functional recovery. The Copenhagen Stroke Study. ''Phys Med Rehabil Clin N Am''. 1999;10(4):887-906.</ref>
* Functional recovery generally completed within '''3-5 months''' depending on severity
* Patients with mild stroke recover within 2 months
* Patients with severe stroke recover within 4-5 months
* Functional recovery is preceded by neurologic recovery by a mean of 2 weeks
'''Factors associated with better outcomes''':<ref name="Srimanan2024">Srimanan W, Panyakorn S. Retrospective analysis of factors related to the long-term recovery of third, fourth, and sixth cranial nerve palsy with etiologies and clinical course in a tertiary hospital. ''Clin Ophthalmol''. 2024;18:1207-1216. doi:10.2147/OPTH.S457891</ref>
* '''Onset of symptoms <7 days''': Adjusted OR 1.73 (95% CI 1.03-2.89) for good long-term outcome
* '''Isolated nerve involvement''': Adjusted OR 2.56 (95% CI 1.21-5.39) for good outcome
'''Post-traumatic outcomes''' (Collet-Sicard syndrome as model):<ref name="Domenicucci2015">Domenicucci M, Mancarella C, Dugoni ED, Ciappetta P, Paolo M. Post-traumatic Collet-Sicard syndrome: Personal observation and review of the pertinent literature. ''Eur Spine J''. 2015;24(3):663-670. doi:10.1007/s00586-014-3542-7</ref>
* '''Atlas (C1) fractures''': Better recovery (1 complete recovery, 4 significant improvement out of 5 cases)
* '''Condylar fractures''': Poorer outcomes (3 unchanged, 6 modest improvement out of 9 cases)
* '''Conservative treatment''' (cervical immobilization) is the treatment of choice
'''COVID-19/ICU-related palsies''':<ref name="Decavel2021"/>
* Most patients recovered within '''one month'''
* Better prognosis than stroke-related palsies
'''General principles''':
* Early identification and treatment of cause improves outcomes
* Swallowing therapy and aspiration precautions reduce complications
* Multidisciplinary management essential
== See Also ==
* [[Wallenberg Syndrome]]
* [[Dejerine Syndrome]]
* [[Vernet Syndrome]]
* [[Collet-Sicard Syndrome]]
* [[Villaret Syndrome]]
* [[Tapia Syndrome]]
* [[Schmidt Syndrome]]
* [[Jugular Foramen Syndrome]]


== References ==
== References ==
<references />
 
<references>
 
<ref name="ACR2022">Expert Panel on Neurological Imaging, Rath TJ, Policeni B, et al. ACR Appropriateness Criteria® Cranial Neuropathy: 2022 Update. ''J Am Coll Radiol''. 2022;19(11S):S263-S285. doi:10.1016/j.jacr.2022.09.002</ref>
 
<ref name="English2018">English SW, Passe TJ, Lindell EP, Klaas JP. Multiple cranial neuropathies as a presentation of spontaneous internal carotid artery dissection: A case report and literature review. ''J Clin Neurosci''. 2018;50:129-131. doi:10.1016/j.jocn.2018.01.049</ref>
 
<ref name="Dejakum2023">Dejakum B, Kiechl S, Knoflach M, Mayer-Suess L. A narrative review on cervical artery dissection-related cranial nerve palsies. ''Front Neurol''. 2023;14:1227484. doi:10.3389/fneur.2023.1227484</ref>
 
<ref name="Mokri1996">Mokri B, Silbert PL, Schievink WI, Piepgras DG. Cranial nerve palsy in spontaneous dissection of the extracranial internal carotid artery. ''Neurology''. 1996;46(2):356-359. doi:10.1212/WNL.46.2.356</ref>
 
<ref name="Decavel2021">Decavel P, Nahmias O, Petit C, Tatu L. Lower cranial nerve palsies in the COVID-19 pandemic: A 10-case series of intensive care unit patients. ''Eur Neurol''. 2021;84(4):252-258. doi:10.1159/000515181</ref>
 
<ref name="Sciacca2019">Sciacca S, Lynch J, Davagnanam I, Barker R. Midbrain, pons, and medulla: Anatomy and syndromes. ''Radiographics''. 2019;39(4):1110-1125. doi:10.1148/rg.2019180126</ref>
 
<ref name="Krasnianski2006">Krasnianski M, Müller T, Stock K, Zierz S. Between Wallenberg syndrome and hemimedullary lesion: Cestan-Chenais and Babinski-Nageotte syndromes in medullary infarctions. ''J Neurol''. 2006;253(5):644-648. doi:10.1007/s00415-006-0025-3</ref>
 
<ref name="Krasnianski2003">Krasnianski M, Neudecker S, Schluter A, Zierz S. Babinski-Nageotte's syndrome and hemimedullary (Reinhold's) syndrome are clinically and morphologically distinct conditions. ''J Neurol''. 2003;250(8):938-942. doi:10.1007/s00415-003-1115-1</ref>
 
<ref name="Labeit2024">Labeit B, Michou E, Trapl-Grundschober M, et al. Dysphagia after stroke: Research advances in treatment interventions. ''Lancet Neurol''. 2024;23(4):418-428. doi:10.1016/S1474-4422(24)00053-3</ref>
 
<ref name="VA2024">Department of Veterans Affairs. Management of stroke rehabilitation (2024). ''VA/DoD Clinical Practice Guidelines''. 2024.</ref>
 
<ref name="AHA2016">Winstein CJ, Stein J, Arena R, et al. Guidelines for adult stroke rehabilitation and recovery: A guideline for healthcare professionals from the American Heart Association/American Stroke Association. ''Stroke''. 2016;47(6):e98-e169. doi:10.1161/STR.0000000000000098</ref>
 
<ref name="Lu2025">Lu Z, Eroglu HS, Naess H, et al. Post-stroke facial palsy: Prevalence, recovery patterns within the first 7 days, risk factors, and effect of hyperacute treatments. ''Clin Rehabil''. 2025;39(1):78-88. doi:10.1177/02692155241285789</ref>
 
<ref name="Jorgensen1999">Jørgensen HS, Nakayama H, Raaschou HO, Olsen TS. Stroke: Neurologic and functional recovery. The Copenhagen Stroke Study. ''Phys Med Rehabil Clin N Am''. 1999;10(4):887-906.</ref>
 
<ref name="Srimanan2024">Srimanan W, Panyakorn S. Retrospective analysis of factors related to the long-term recovery of third, fourth, and sixth cranial nerve palsy with etiologies and clinical course in a tertiary hospital. ''Clin Ophthalmol''. 2024;18:1207-1216. doi:10.2147/OPTH.S457891</ref>
 
<ref name="Domenicucci2015">Domenicucci M, Mancarella C, Dugoni ED, Ciappetta P, Paolo M. Post-traumatic Collet-Sicard syndrome: Personal observation and review of the pertinent literature. ''Eur Spine J''. 2015;24(3):663-670. doi:10.1007/s00586-014-3542-7</ref>
 
<ref name="Kim2000">Kim H, Chung CS, Lee KH, Robbins J. Aspiration subsequent to a pure medullary infarction: Lesion sites, clinical variables, and outcome. ''Arch Neurol''. 2000;57(4):478-483. doi:10.1001/archneur.57.4.478</ref>
 
<ref name="Pearce2007">Pearce JM. Hughlings Jackson and the medullary syndromes. ''J Neurol Neurosurg Psychiatry''. 2007;78(1):1. doi:10.1136/jnnp.2006.106245</ref>
 
<ref name="Ropper2019">Ropper AH, Samuels MA, Klein JP, Prasad S. ''Adams and Victor's Principles of Neurology''. 11th ed. McGraw-Hill; 2019. pp. 796-797.</ref>
 
<ref name="York2011">York GK, Steinberg DA. Hughlings Jackson's neurological ideas. ''Brain''. 2011;134(Pt 10):3106-3113. doi:10.1093/brain/awr219</ref>
 
</references>
 
{{Reflist}}
 
[[Category:Head and Neck]]
[[Category:Skull Base]]
[[Category:Cranial Nerve Disorders]]
[[Category:Medullary Syndromes]]
[[Category:Neurological Disorders]]
[[Category:Neuro-Otology]]

Latest revision as of 00:35, 3 February 2026


  1. Jackson Syndrome

Overview

Jackson syndrome is a rare medullary (brainstem) syndrome characterized by dysfunction of cranial nerve X (vagus), cranial nerve XI (accessory), and cranial nerve XII (hypoglossal), resulting from lesions affecting the nucleus ambiguus and hypoglossal nucleus region in the ventrolateral medulla oblongata.[1][2]

The syndrome produces ipsilateral paralysis of the soft palate, larynx, sternocleidomastoid, trapezius, and tongue.[2]

Critical anatomical distinction: Jackson syndrome is specifically a central (medullary) syndrome, distinguishing it from the peripheral skull base syndromes (Vernet, Collet-Sicard, Villaret) which involve the same cranial nerves but at different anatomical locations (jugular foramen, hypoglossal canal, retroparotid space).[3] This distinction has critical prognostic implications: peripheral cranial nerve palsies mostly resolve completely over time, while central palsies from brainstem stroke typically do not.[4]

History

John Hughlings Jackson (1835-1911) was one of the founding fathers of British neurology and worked primarily at the National Hospital for the Paralysed and Epileptic at Queen Square, London. He made seminal contributions to understanding epilepsy, aphasia, and the hierarchical organization of the nervous system.[5]

Jackson first reported the syndrome in 1864, and described a further case caused by medullary hemorrhage in 1872 with hypoglossal nerve palsy and incomplete vagal paresis. His work was part of a broader 19th-century effort to map brainstem syndromes to specific anatomical locations. Other medullary syndromes described during this era include Wallenberg syndrome (lateral medullary), Dejerine syndrome (medial medullary), and Avellis syndrome (vagus and spinothalamic tract).[5]

Pathophysiology

Relevant Anatomy

Medullary nuclei involved:[2][6]

Nucleus ambiguus:

Hypoglossal nucleus:

  • Located in dorsomedial medulla near floor of fourth ventricle
  • Provides motor innervation to all intrinsic and most extrinsic tongue muscles
  • Forms hypoglossal triangle in floor of fourth ventricle
  • Hypoglossal involvement is a key distinguishing feature separating hemimedullary (Reinhold) syndrome from Babinski-Nageotte syndrome[7]

Spinal accessory nucleus:

Vascular supply:

Disease Etiology

Causes of Jackson syndrome:[2][3]

Vascular (most common):

Internal carotid artery dissection (important underrecognized cause):[4][8][9]

  • Cranial nerve palsy occurs in approximately 10% of spontaneous cervical artery dissections
  • Mechanism differs by dissection type:
    • Steno-occlusive dissections (proximal ICA): Cause CN II, III, VII palsies via hypoperfusion/microembolism
    • Expansive dissections (distal ICA): Cause CN IX, X, XI, XII palsies via local mass effect from pseudoaneurysm formation
  • Critical clinical point: Peripheral palsies from dissection mostly resolve completely; central palsies from brainstem stroke do not—making cerebrovascular imaging essential for prognosis

COVID-19/ICU-related (emerging cause):[10]

  • 11% of ICU patients (10/88) developed lower cranial nerve palsies after severe COVID-19
  • Hypoglossal nerve palsy most common (9/10 patients)
  • Mechanism: Mechanical compression from prone-position ventilation therapy
  • Most patients recovered within one month

Neoplastic:

Demyelinating:

Infectious/Inflammatory:

Traumatic:

  • Skull base fractures (atlas or condylar fractures)
  • Penetrating trauma

Congenital:

Genetics

No genetic predisposition specific to Jackson syndrome; underlying conditions (e.g., connective tissue disorders predisposing to dissection, familial tumor syndromes) may have genetic components.

Histology

Histological findings depend on etiology:

  • Vascular: Infarction, gliosis, neuronal loss in affected nuclei
  • Neoplastic: Tumor-specific histology
  • Demyelinating: Demyelinated plaques, inflammation

Diagnosis

Patient History

Presenting symptoms reflect involvement of CN X, XI, and XII:[2]

Swallowing difficulties (dysphagia):

  • Difficulty with bolus control
  • Nasal regurgitation
  • Aspiration
  • Coughing/choking with meals

Voice changes:

  • Hoarseness or breathy voice
  • Diplophonia
  • Reduced vocal projection

Speech difficulties (dysarthria):

  • Slurred speech
  • Difficulty with lingual consonants
  • Nasal speech quality

Neck/shoulder weakness:

  • Difficulty turning head
  • Shoulder drop
  • Arm elevation weakness

Associated symptoms (depending on lesion extent):

  • Headache (if vascular or mass lesion)
  • Vertigo
  • Ataxia
  • Contralateral sensory loss (if long tracts involved)

Physical Examination

Cranial nerve X examination:

  • Palate: Ipsilateral palate droop, uvula deviation to contralateral side
  • Gag reflex: Diminished on affected side
  • Voice: Hoarseness, breathiness

Cranial nerve XI examination:

Cranial nerve XII examination:

  • Tongue at rest: May show fasciculations (LMN lesion)
  • Tongue protrusion: Deviates toward affected side
  • Tongue bulk: Ipsilateral atrophy in chronic cases
  • Difficulty with rapid alternating tongue movements

Laryngoscopy findings:

  • Ipsilateral vocal fold paralysis
  • Pooling of secretions
  • Reduced palatal elevation

Laboratory Tests

Laboratory evaluation focuses on underlying etiology:

Imaging: 2022 ACR Appropriateness Criteria

ACR Appropriateness Criteria (2022) provide detailed recommendations for multiple lower cranial nerve palsies:[3]

MRI head with contrast (preferred initial imaging):

  • Indications: Evaluating posterior skull base pathology, posterior fossa lesions, brainstem pathology, leptomeningeal processes
  • Sequences:
    • DWI/ADC: Essential for acute brainstem infarction detection (though false-negatives can occur with very small brainstem infarcts)
    • T1 pre/post-contrast: Mass lesions, enhancement patterns
    • T2/FLAIR: Demyelination, edema
    • GRE/SWI: Hemorrhage detection

Advanced MRI techniques:[3]

  • Thin-cut heavily T2-weighted contrast-enhanced modified balanced SSFP sequences: Provide detailed imaging of lower cranial nerves within the jugular foramen, with 90-100% of CN IX, X, and XII visible
  • Contrast-enhanced MRA: Evaluates relationship of nerves to vascular structures

CTA head and neck:[3][8]

  • Indication: When internal carotid artery dissection is clinically suspected
  • Sensitivity: 66% for blunt carotid vascular injury (most false negatives are low-grade injuries)
  • T1-weighted axial cervical MRI with fat-saturation provides highest sensitivity and specificity for dissection

Important imaging consideration:[3] Complete evaluation of CN IX, XI, and XII requires head and neck imaging since these nerves extend into the neck. For CN X, evaluation of the head, neck, and upper chest (to the aortopulmonary window) is necessary to include the recurrent laryngeal nerve.

Differential Diagnosis

There are several named syndromes differentiating the various cranial nerve deficits that can result from skull base masses and lesions. These should be considered based on cranial nerve involvement.

These syndromes and their respective cranial nerve involvement are outlined in the table below.

Cranial Nerve Involvement in Skull Base Masses
Syndrome CN IX CN X CN XI CN XII Sympathetics
Vernet Syndrome ✔ ✔ ✔
Collet-Sicard Syndrome ✔ ✔ ✔ ✔
Villaret Syndrome ✔ ✔ ✔ ✔ ✔
Tapia Syndrome ✔ ± ✔ ±
Jackson Syndrome ✔ ✔ ✔
Schmidt Syndrome ✔ ✔

Comparison of Medullary Syndromes

Critical distinctions for medullary syndrome classification:[11][7][6]

Syndrome Cranial Nerves Key Features Lesion Location
Wallenberg (lateral medullary) V, VIII, IX, X Horner syndrome, ataxia, crossed sensory loss Lateral medulla (PICA territory)
Dejerine (medial medullary) XII Contralateral hemiparesis, deep sensory loss Medial medulla (ASA territory)
Jackson X, XI, XII No long tract signs Ventrolateral medulla
Babinski-Nageotte Wallenberg + contralateral hemiparesis All Wallenberg features + pyramidal signs; NO hypoglossal palsy Intermediolateral medulla
Hemimedullary (Reinhold) XII + Wallenberg features Hypoglossal palsy is invariable Complete hemimedulla
Avellis X Spinothalamic involvement (crossed sensory loss) Nucleus ambiguus + spinothalamic tract

Critical distinction: Babinski-Nageotte syndrome is NOT identical to hemimedullary syndrome—hypoglossal palsy is not part of Babinski-Nageotte syndrome but is invariable in hemimedullary (Reinhold) syndrome.[7]

Management

Medical Management

Treatment focuses on underlying etiology and supportive care:[2]

Etiologic treatment:

Dysphagia Management: Evidence-Based Rehabilitation

Instrumental evaluation is essential:[12]

  • Videofluoroscopy or FEES is necessary to visualize swallow physiology and determine presence/absence of aspiration
  • Bedside evaluation alone cannot predict aspiration—patients can aspirate without overt clinical signs

Behavioral therapy protocols with evidence (2024 Lancet Neurology review):[13]

Chin-tuck against resistance (CTAR):[13][14]

  • Meta-analysis of 8 RCTs showed improvements in swallowing safety and oral intake
  • More effective than Shaker exercises
  • Decreased aspiration in patients with post-stroke dysphagia

Shaker exercises:

  • Head-lifting exercise to increase laryngeal elevation and upper esophageal sphincter opening
  • RCT showed improvement in penetration-aspiration scale

Expiratory muscle strength training (EMST):[13]

  • Reduces penetrations/aspirations and improves oral intake

Neurostimulation approaches:[13]

  • Transcranial direct current stimulation (tDCS) and repetitive transcranial magnetic stimulation (rTMS): Promising results for promoting neuroplasticity
  • Pharyngeal electrical stimulation: Emerging evidence
  • However, high-quality studies showing effects on pneumonia, functional outcome, or mortality are scarce

Timing of interventions:[13]

  • Acute phase: Focus on complication prevention; enteral nutrition via nasogastric tube if needed
  • Post-acute/chronic phase: All dysphagia therapies including restitutive measures; PEG for chronic dysphagia

Aspiration risk stratification:[15]

  • Aspiration occurrence depends critically on lesion location
  • Middle-level lesions, particularly those that are inferior-dorsolateral, are most strongly associated with aspiration

Voice Rehabilitation

  • Speech therapy for dysarthria
  • Vocal exercises
  • Lee Silverman Voice Treatment (LSVT) for reduced loudness

Surgical Management

Surgical intervention depends on etiology:

Tumor resection:

  • Skull base approaches for accessible lesions
  • Debulking for non-resectable tumors

Vascular intervention:

Vocal fold medialization (for persistent vocal fold paralysis):

Palatal surgery:

  • Palatal lift prosthesis
  • Palatopharyngeal surgery (rarely indicated)

Outcomes

Complications

Prognosis

Critical prognostic distinction: Peripheral vs Central Palsies:[4]

  • Peripheral palsies (from dissection, compression): Mostly resolve completely over time
  • Central palsies (from brainstem stroke): Do not typically resolve
  • This distinction is critical for patient counseling

Post-stroke recovery patterns:[16]

  • Functional recovery generally completed within 3-5 months depending on severity
  • Patients with mild stroke recover within 2 months
  • Patients with severe stroke recover within 4-5 months
  • Functional recovery is preceded by neurologic recovery by a mean of 2 weeks

Factors associated with better outcomes:[17]

  • Onset of symptoms <7 days: Adjusted OR 1.73 (95% CI 1.03-2.89) for good long-term outcome
  • Isolated nerve involvement: Adjusted OR 2.56 (95% CI 1.21-5.39) for good outcome

Post-traumatic outcomes (Collet-Sicard syndrome as model):[18]

  • Atlas (C1) fractures: Better recovery (1 complete recovery, 4 significant improvement out of 5 cases)
  • Condylar fractures: Poorer outcomes (3 unchanged, 6 modest improvement out of 9 cases)
  • Conservative treatment (cervical immobilization) is the treatment of choice

COVID-19/ICU-related palsies:[10]

  • Most patients recovered within one month
  • Better prognosis than stroke-related palsies

General principles:

  • Early identification and treatment of cause improves outcomes
  • Swallowing therapy and aspiration precautions reduce complications
  • Multidisciplinary management essential

See Also

References

  1. ↑ Pearce JM. Hughlings Jackson and the medullary syndromes. J Neurol Neurosurg Psychiatry. 2007;78(1):1. doi:10.1136/jnnp.2006.106245
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Ropper AH, Samuels MA, Klein JP, Prasad S. Adams and Victor's Principles of Neurology. 11th ed. McGraw-Hill; 2019. pp. 796-797.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Expert Panel on Neurological Imaging, Rath TJ, Policeni B, et al. ACR Appropriateness Criteria® Cranial Neuropathy: 2022 Update. J Am Coll Radiol. 2022;19(11S):S263-S285. doi:10.1016/j.jacr.2022.09.002
  4. ↑ 4.0 4.1 4.2 Dejakum B, Kiechl S, Knoflach M, Mayer-Suess L. A narrative review on cervical artery dissection-related cranial nerve palsies. Front Neurol. 2023;14:1227484. doi:10.3389/fneur.2023.1227484
  5. ↑ 5.0 5.1 York GK, Steinberg DA. Hughlings Jackson's neurological ideas. Brain. 2011;134(Pt 10):3106-3113. doi:10.1093/brain/awr219
  6. ↑ 6.0 6.1 Sciacca S, Lynch J, Davagnanam I, Barker R. Midbrain, pons, and medulla: Anatomy and syndromes. Radiographics. 2019;39(4):1110-1125. doi:10.1148/rg.2019180126
  7. ↑ 7.0 7.1 7.2 Krasnianski M, Neudecker S, Schluter A, Zierz S. Babinski-Nageotte's syndrome and hemimedullary (Reinhold's) syndrome are clinically and morphologically distinct conditions. J Neurol. 2003;250(8):938-942. doi:10.1007/s00415-003-1115-1
  8. ↑ 8.0 8.1 English SW, Passe TJ, Lindell EP, Klaas JP. Multiple cranial neuropathies as a presentation of spontaneous internal carotid artery dissection: A case report and literature review. J Clin Neurosci. 2018;50:129-131. doi:10.1016/j.jocn.2018.01.049
  9. ↑ Mokri B, Silbert PL, Schievink WI, Piepgras DG. Cranial nerve palsy in spontaneous dissection of the extracranial internal carotid artery. Neurology. 1996;46(2):356-359. doi:10.1212/WNL.46.2.356
  10. ↑ 10.0 10.1 Decavel P, Nahmias O, Petit C, Tatu L. Lower cranial nerve palsies in the COVID-19 pandemic: A 10-case series of intensive care unit patients. Eur Neurol. 2021;84(4):252-258. doi:10.1159/000515181
  11. ↑ Krasnianski M, Müller T, Stock K, Zierz S. Between Wallenberg syndrome and hemimedullary lesion: Cestan-Chenais and Babinski-Nageotte syndromes in medullary infarctions. J Neurol. 2006;253(5):644-648. doi:10.1007/s00415-006-0025-3
  12. ↑ Winstein CJ, Stein J, Arena R, et al. Guidelines for adult stroke rehabilitation and recovery: A guideline for healthcare professionals from the American Heart Association/American Stroke Association. Stroke. 2016;47(6):e98-e169. doi:10.1161/STR.0000000000000098
  13. ↑ 13.0 13.1 13.2 13.3 13.4 Labeit B, Michou E, Trapl-Grundschober M, et al. Dysphagia after stroke: Research advances in treatment interventions. Lancet Neurol. 2024;23(4):418-428. doi:10.1016/S1474-4422(24)00053-3
  14. ↑ Department of Veterans Affairs. Management of stroke rehabilitation (2024). VA/DoD Clinical Practice Guidelines. 2024.
  15. ↑ Kim H, Chung CS, Lee KH, Robbins J. Aspiration subsequent to a pure medullary infarction: Lesion sites, clinical variables, and outcome. Arch Neurol. 2000;57(4):478-483. doi:10.1001/archneur.57.4.478
  16. ↑ Jørgensen HS, Nakayama H, Raaschou HO, Olsen TS. Stroke: Neurologic and functional recovery. The Copenhagen Stroke Study. Phys Med Rehabil Clin N Am. 1999;10(4):887-906.
  17. ↑ Srimanan W, Panyakorn S. Retrospective analysis of factors related to the long-term recovery of third, fourth, and sixth cranial nerve palsy with etiologies and clinical course in a tertiary hospital. Clin Ophthalmol. 2024;18:1207-1216. doi:10.2147/OPTH.S457891
  18. ↑ Domenicucci M, Mancarella C, Dugoni ED, Ciappetta P, Paolo M. Post-traumatic Collet-Sicard syndrome: Personal observation and review of the pertinent literature. Eur Spine J. 2015;24(3):663-670. doi:10.1007/s00586-014-3542-7

Cite error: <ref> tag with name "Lu2025" defined in <references> is not used in prior text.

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