Schmidt Syndrome: Difference between revisions

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{{infobox Disease
{{Infobox Disease
|Title              =  
|name = Vagoaccessory Syndrome
|Aliases            =  
|synonyms = Schmidt syndrome (neurological), CN X-XI palsy, Combined vagus-accessory nerve paralysis
|Image              =  
|image = [[File:Jugular_foramen_anatomy.jpg|250px]]
|Caption            =  
|caption = Jugular foramen transmitting CN IX, X, and XI—vagoaccessory syndrome represents isolated X-XI involvement
|ICD-9              =  
|field = [[Neurology]], [[Otolaryngology]], [[Skull Base Surgery]]
|ICD-10            =  
|symptoms = Hoarseness/dysphonia, dysphagia, nasal regurgitation, shoulder droop, weak head turning
|MeSH              =  
|onset = Variable (acute to gradual depending on etiology)
|Gene              =  
|duration = Variable; may be permanent depending on cause
|Locus              =  
|types =
|OMIM              =  
|causes = Brainstem lesions (stroke, demyelination), skull base tumors, trauma, infection
|EyeWiki           =  
|risks = Vascular disease, malignancy, head trauma
|Radiopaedia       =  
|diagnosis = MRI brain/skull base (modality of choice), CT for bony detail, laryngeal EMG
|differential = [[Vernet syndrome]], [[Collet-Sicard syndrome]], [[Jackson syndrome]], [[Tapia syndrome]]
|prevention =
|treatment = Etiology-specific; supportive care for dysphagia and dysphonia
|prognosis = Variable by etiology; idiopathic/infectious cases may recover completely
|frequency = Rare (isolated X-XI involvement less common than Vernet syndrome)
|deaths =
|ICD10 = G52.8
|ICD9 = 352.9
|MeSH =
|EyeWiki =
|Radiopaedia = https://radiopaedia.org/articles/jugular-foramen-syndrome
}}
}}


== Overview ==
== Overview ==
=== History ===
 
{{Clinical Caveat|'''Terminology Confusion''': The term "Schmidt syndrome" in medical literature '''overwhelmingly refers''' to '''autoimmune polyendocrine syndrome type 2 (APS-2)''', an endocrinological condition involving autoimmune thyroid disease with type 1 diabetes or adrenal insufficiency.<ref name="Otsuka1996">Otsuka F, Ogura T, Hayakawa N, et al. A case of Schmidt syndrome accompanied by a pituitary adenoma. ''Endocr J''. 1996;43(5):531-535.</ref><ref name="Betterle1996">Betterle C, Volpato M, Greggio AN, Presotto F. Type 2 polyglandular autoimmune disease (Schmidt's syndrome). ''J Pediatr Endocrinol Metab''. 1996;9 Suppl 1:113-123.</ref><ref name="Watson1996">Watson JP, Lewis RA. Schmidt's syndrome associated with sarcoidosis. ''Postgrad Med J''. 1996;72(843):60-61.</ref> The neurological use of "Schmidt syndrome" for isolated CN X-XI palsy is '''rarely documented in contemporary literature''' and may not represent a well-established distinct entity.'''Recommended terminology:''' "'''Vagoaccessory syndrome'''" or "combined CN X-XI palsy" is preferred for clarity. Clinicians should be aware that this presentation is less common than [[Vernet syndrome]] (CN IX-X-XI), since CN IX typically traverses the jugular foramen with CN X and XI and is usually affected together.}}
 
'''Vagoaccessory syndrome''' (historically called "Schmidt syndrome" in neurological contexts) is a [[Cranial nerve|cranial nerve]] syndrome characterized by combined paralysis of [[Vagus nerve|cranial nerve X (vagus)]] and [[Accessory nerve|cranial nerve XI (accessory)]], '''with sparing of CN IX (glossopharyngeal)'''.<ref name="Ropper2019">Ropper AH, Samuels MA, Klein JP, Prasad S. ''Adams and Victor's Principles of Neurology''. 11th ed. McGraw-Hill; 2019.</ref> The syndrome results in [[Paralysis|ipsilateral paralysis]] of the [[Soft palate|soft palate]], [[Pharynx|pharynx]], and [[Larynx|larynx]] (vagus) along with weakness of the [[Sternocleidomastoid muscle|sternocleidomastoid]] and [[Trapezius muscle|trapezius]] muscles (accessory nerve).<ref name="StatPearls_JuguarForamen">Tubbs RS, Loukas M, Cohen-Gadol AA. "Anatomy, Head and Neck: Jugular Foramen." ''StatPearls''. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK538507/</ref>
 
=== Distinction from Vernet Syndrome ===
 
The key distinction of vagoaccessory syndrome from the more commonly described [[Vernet syndrome]] (jugular foramen syndrome) is the '''sparing of CN IX (glossopharyngeal)''':<ref name="Ferreira2018">Ferreira J, Franco A, Teodoro T, Coelho M, Albuquerque L. Vernet syndrome resulting from varicella zoster virus infection—a very rare clinical presentation of a common viral infection. ''J Neurovirol''. 2018;24(6):772-775. doi:10.1007/s13365-018-0674-4</ref><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):S271-S293. doi:10.1016/j.jacr.2022.09.012</ref>
 
{| class="wikitable"
|+ '''Vagoaccessory Syndrome vs Vernet Syndrome'''
|-
! Feature !! Vagoaccessory (Schmidt) !! Vernet Syndrome
|-
| CN IX || '''Spared''' || '''Affected'''
|-
| CN X || Affected || Affected
|-
| CN XI || Affected || Affected
|-
| Frequency || '''Rare''' || More common
|-
| Anatomical basis || Selective brainstem or extracranial lesion || Jugular foramen lesion (all nerves affected)
|}
 
'''Anatomical paradox:''' Since CN IX, X, and XI all traverse the [[Jugular foramen|jugular foramen]], isolated X-XI involvement with sparing of CN IX is '''anatomically unusual''' for jugular foramen pathology. This isolated pattern is more likely to occur with:<ref name="Ong2010">Ong CK, Chong VF. The glossopharyngeal, vagus and spinal accessory nerves. ''Eur J Radiol''. 2010;74(2):359-367. doi:10.1016/j.ejrad.2009.08.004</ref>
* Lesions of the '''nucleus ambiguus''' (brainstem), which provides motor fibers for CN X and the cranial portion of CN XI but not the sensory components of CN IX
* '''Selective extracranial lesions''' affecting X and XI after they diverge from IX
* '''Idiopathic cranial polyneuropathy''' with selective nerve involvement
 
Vagoaccessory syndrome is caused by [[Lesion|lesions]] affecting the [[Nucleus ambiguus|nucleus ambiguus]] (which gives rise to [[Motor nerve fiber|motor fibers]] for both CN X and the cranial portion of CN XI) or affecting both nerves along their course after separation from CN IX. Causes include [[Brainstem|brainstem]] lesions ([[Stroke|stroke]], [[Demyelination|demyelination]], [[Tumor|tumor]]) and selective [[Skull base]] pathology.<ref name="StatPearls_NucleusAmbiguus">Tubbs RS, Loukas M, Khalili M, Khalili N, Cohen-Gadol AA. "Neuroanatomy, Nucleus Ambiguus." ''StatPearls''. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK547744/</ref>
 
== History ==
 
{{Evidence Note|The historical attribution of this syndrome to Adolf Schmidt (1865–1918) describing combined vagus-accessory paralysis in 1892 '''cannot be verified''' from available contemporary medical literature. The specific citation for this attribution remains elusive. Clinicians should be aware that the eponymous designation may not be well-established, and "vagoaccessory syndrome" or "combined CN X-XI palsy" may be more appropriate terminology.}}
 
The neurological "Schmidt syndrome" is attributed to [[Adolf Schmidt (physician)|Adolf Schmidt]] (1865–1918), a German physician who reportedly described the combination of vagus and accessory nerve paralysis, potentially in 1892. However, this historical claim requires verification, as contemporary literature searches do not readily confirm this specific attribution.
 
The [[Medulla oblongata|medulla]] contains a concentration of [[Cranial nerve nuclei|cranial nerve nuclei]] in a small area, making it susceptible to producing distinct clinical syndromes when affected by focal lesions. The late 19th and early 20th centuries saw extensive efforts to map specific [[Brainstem syndromes|brainstem syndromes]] to anatomical locations, including:<ref name="Ropper2019"/>
* '''Wallenberg syndrome''' (1895): Lateral medullary infarction
* '''Vernet syndrome''' (1918): Jugular foramen syndrome (CN IX-X-XI)
* '''Collet-Sicard syndrome''' (1915/1917): CN IX-X-XI-XII
 
The isolated combination of CN X and XI palsy (vagoaccessory syndrome) is '''less commonly described''' than Vernet syndrome in both historical and contemporary literature, likely because most jugular foramen lesions affect CN IX along with X and XI.<ref name="ACR2022"/>


== Pathophysiology ==
== Pathophysiology ==
=== Relevant Anatomy ===
=== Relevant Anatomy ===
'''Anatomical basis for combined CN X and XI involvement''':<ref name="Cranial_Nerves_IX_X">National Institutes of Health. "Cranial Nerves IX and X: The Glossopharyngeal and Vagus Nerves." ''Clinical Methods: The History, Physical, and Laboratory Examinations''. 3rd ed. NCBI Bookshelf; 1990. https://www.ncbi.nlm.nih.gov/books/NBK386/</ref>
'''[[Nucleus ambiguus]]''':<ref name="StatPearls_NucleusAmbiguus"/>
* Located in the [[Ventrolateral medulla|ventrolateral medulla]]
* [[Motor nucleus|Motor nucleus]] for CN IX, X, and cranial portion of XI
* Provides [[Efferent fiber|efferent fibers]] for:
** [[Pharyngeal muscles]] (CN X)
** [[Laryngeal muscles]] (CN X via [[Recurrent laryngeal nerve]])
** {{nobr|Soft palate}} (CN X)
** [[Esophagus|Upper esophagus]] (CN X)
* Cranial root of XI arises from nucleus ambiguus and joins vagus
'''[[Spinal accessory nucleus]]''':<ref name="StatPearls_AccessoryNerve">Tubbs RS, Loukas M, Khalili M, Khalili N, Cohen-Gadol AA. "Neuroanatomy, Cranial Nerve 11 (Accessory)." ''StatPearls''. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK507722/</ref>
* Located in [[Cervical spinal cord]] (C1–C5)
* Gives rise to [[Spinal root|spinal root]] of CN XI
* Motor to sternocleidomastoid and trapezius
'''Course of [[Cranial nerves|cranial nerves]] X and XI''':<ref name="StatPearls_JuguarForamen"/>
'''[[Vagus nerve]] (X)''':<ref name="Cranial_Nerves_IX_X"/>
* Exits [[Medulla oblongata|medulla]] from [[Postolivary sulcus|postolivary sulcus]]
* Traverses [[Jugular foramen]]
* Multiple branches providing [[Motor nerve|motor]], [[Sensory nerve|sensory]], and [[Parasympathetic nervous system|parasympathetic]] innervation
'''[[Accessory nerve]] (XI)''':<ref name="StatPearls_AccessoryNerve"/>
* Cranial root: From nucleus ambiguus; joins vagus to supply laryngeal muscles
* Spinal root: From cervical spinal cord; provides motor to {{nobr|SCM}} and trapezius
* Both roots exit skull through jugular foramen
* Spinal root continues to muscles; cranial root joins vagus
'''Location of combined lesions''':<ref name="Wallenberg_Syndrome">Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Lateral Medullary Syndrome (Wallenberg Syndrome)." ''StatPearls''. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK551670/</ref>
Lesions causing Schmidt syndrome may occur at:
# '''Nucleus ambiguus''': [[Medullary lesion|Medullary lesion]] affecting both nuclei
# '''Intracranial course''': Near jugular foramen
# '''Jugular foramen''': Where CN X and XI pass together
# '''Extracranial course''': After exiting jugular foramen
=== Disease Etiology ===
=== Disease Etiology ===
=== Genetics ===
 
=== Histology ===
'''Brainstem lesions''' ('''most likely to produce isolated X-XI involvement'''):<ref name="Wallenberg_Syndrome"/><ref name="Ropper2019"/>
 
Brainstem lesions affecting the '''nucleus ambiguus''' are the most likely etiology for true isolated X-XI palsy with IX sparing, since the nucleus ambiguus provides motor output for X and the cranial root of XI, while CN IX has separate sensory nuclei.
 
* [[Lateral medullary infarction|Lateral medullary infarction]] ([[Wallenberg syndrome|Wallenberg syndrome]] variant)
* [[Medial medullary infarction|Medial medullary infarction]] ([[Dejerine syndrome|Dejerine syndrome]] variant)
* [[Brainstem hemorrhage|Brainstem hemorrhage]]
* [[Demyelinating disease|Demyelinating disease]] ([[Multiple sclerosis|multiple sclerosis]])
* [[Brainstem tumor|Brainstem tumor]] ([[Glioma|glioma]], [[Brain metastasis|metastasis]])
* [[Syringobulbia|Syringobulbia]]
 
'''Skull base lesions''':<ref name="StatPearls_JuguarForamen"/><ref name="Glomus_Jugulare">Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Glomus Jugulare." ''StatPearls''. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK560489/</ref>
 
Most jugular foramen tumors produce [[Vernet syndrome]] (CN IX-X-XI) rather than isolated X-XI involvement. Selective X-XI involvement may occur with:
* [[Jugular foramen]] tumors with selective nerve involvement ([[Paraganglioma|paraganglioma]], [[Schwannoma|schwannoma]], [[Meningioma|meningioma]])<ref name="Oushy2018">Oushy S, Graffeo CS, Perry A, et al. Collet-Sicard syndrome attributable to extramedullary plasmacytoma of the jugular foramen. ''World Neurosurg''. 2018;115:47-51. doi:10.1016/j.wneu.2018.04.008</ref><ref name="Mutlu2019">Mutlu V, Ogul H. Magnetic resonance imaging features of Collet-Sicard syndrome associated with glomus jugulare paraganglioma. ''J Craniofac Surg''. 2019;30(3):e250-e252. doi:10.1097/SCS.0000000000005275</ref>
* [[Skull base metastasis|Skull base metastases]]
* [[Nasopharyngeal carcinoma]] with skull base extension
* [[Chordoma|Chordoma]], [[Chondrosarcoma|chondrosarcoma]]
* '''Developmental abnormalities''' of the craniocervical junction<ref name="Kang2016">Kang K, Moon BG. Developmental abnormalities of the craniocervical junction resulting in Collet-Sicard syndrome. ''Spine J''. 2016;16(2):e59-e62. doi:10.1016/j.spinee.2015.08.058</ref>
* '''Cervical osteophytes''' compressing jugular foramen<ref name="Le2014">Le AQ, Walcott BP, Redjal N, Coumans JV. Cervical osteophyte resulting in compression of the jugular foramen: case report. ''J Neurosurg Spine''. 2014;20(4):429-433. doi:10.3171/2013.12.SPINE13666</ref>
 
'''Trauma''':<ref name="Ropper2019"/><ref name="Alberio2005">Alberio N, Cultrera F, Antonelli V, Servadei F. Isolated glossopharyngeal and vagus nerves palsy due to fracture involving the left jugular foramen. ''Acta Neurochir (Wien)''. 2005;147(7):787-789. doi:10.1007/s00701-005-0539-y</ref><ref name="Coello2010">Coello AF, Canals AG, Gonzalez JM, Martín JJ. Cranial nerve injury after minor head trauma. ''J Neurosurg''. 2010;113(3):547-555. doi:10.3171/2010.6.JNS091620</ref>
* [[Skull base fracture|Skull base fractures]] involving jugular foramen
* [[Penetrating trauma|Penetrating trauma]]
* [[Iatrogenic injury|Iatrogenic]] ([[Surgery|surgery]], particularly neck dissection)
 
'''Vascular''':<ref name="Wallenberg_Syndrome"/><ref name="Lee2019">Lee M, Heo Y, Kim T. Vernet's syndrome associated with internal jugular vein thrombosis. ''J Stroke Cerebrovasc Dis''. 2019;28(8):e104-e106. doi:10.1016/j.jstrokecerebrovasdis.2019.04.028</ref><ref name="Daley2014">Daley NC, Colliver EB. A case of Vernet syndrome associated with internal jugular phlebectasia. ''PM R''. 2014;6(9):857-860. doi:10.1016/j.pmrj.2014.02.016</ref>
* [[Vertebral artery dissection]] or [[Aneurysm|aneurysm]]
* '''[[Internal jugular vein thrombosis]]'''—well-documented cause of jugular foramen syndromes<ref name="Lee2019"/>
* '''Internal jugular vein phlebectasia'''<ref name="Daley2014"/>
 
'''Infectious/Inflammatory''':<ref name="Ropper2019"/><ref name="Ferreira2018"/>
* '''[[Herpes zoster ophthalmicus|Varicella zoster virus (VZV)]]'''—documented cause of Vernet syndrome<ref name="Ferreira2018"/>
* [[Skull base osteomyelitis|Skull base osteomyelitis]]
* [[Meningitis|Meningitis]] (particularly at skull base)
* [[Sarcoidosis|Sarcoidosis]]
 
'''Idiopathic''':<ref name="Yoshihara2012">Yoshihara N, Okuda M, Takano K, Wada T, Osaka H. Idiopathic cranial polyneuropathy with unilateral IX and X and contralateral XI nerve palsy in a 4-year-old boy. ''Pediatr Neurol''. 2012;46(4):263-265. doi:10.1016/j.pediatrneurol.2012.01.014</ref>
* '''Idiopathic cranial polyneuropathy'''—may present with selective lower cranial nerve involvement; pediatric cases may recover completely with corticosteroids<ref name="Yoshihara2012"/>


== Diagnosis ==
== Diagnosis ==
=== Patient History ===
=== Patient History ===
'''Symptoms reflect CN X and XI dysfunction''':<ref name="Cranial_Nerves_IX_X"/><ref name="Wallenberg_Syndrome"/>
'''[[Vagus nerve]] (X) symptoms''':<ref name="Bilateral_Vocal_Cord">Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Bilateral Vocal Cord Paralysis." ''StatPearls''. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK560852/</ref>
* '''[[Dysphagia]]''': Difficulty swallowing, particularly liquids
* '''[[Dysphonia]]''': Hoarse, breathy voice
* '''[[Nasopharyngeal regurgitation|Nasal regurgitation]]''': Liquids coming out of nose
* '''[[Aspiration]]''': Coughing with eating/drinking
* '''Reduced cough''': Weak cough reflex
'''[[Accessory nerve]] (XI) symptoms''':<ref name="StatPearls_AccessoryNerve"/>
* '''Shoulder droop''': Weakness of trapezius
* '''Difficulty elevating arm''': Above horizontal plane
* '''Weakness turning head''': To contralateral side ({{nobr|SCM}} weakness)
* '''Neck/shoulder pain''': From muscle weakness
'''Associated symptoms''' depend on etiology:<ref name="Ropper2019"/>
* [[Headache]] ([[Vascular disease|vascular]], [[Tumor|tumor]])
* [[Facial numbness|Facial numbness]] (if CN V involved)
* [[Hearing loss]], [[Vertigo]] (if CN VIII involved)
* [[Ataxia]] ([[Cerebellar disease|cerebellar]] involvement)
=== Physical Examination ===
=== Physical Examination ===
'''[[Cranial nerve]] X examination''':<ref name="Cranial_Nerves_IX_X"/><ref name="Cranial_Nerve_Testing">Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Cranial Nerve Testing." ''StatPearls''. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK585066/</ref>
* '''[[Soft palate|Palate]]''': Ipsilateral droop, [[Uvula]] deviates to contralateral side
* '''[[Gag reflex|Gag reflex]]''': Diminished on affected side (efferent limb)
* '''[[Voice|Voice]]''': Hoarse, breathy quality
* '''[[Laryngoscopy]]''': Ipsilateral [[Vocal fold paralysis|vocal fold paralysis]], pooling of secretions
'''[[Accessory nerve]] (XI) examination''':<ref name="StatPearls_AccessoryNerve"/>
* '''[[Sternocleidomastoid muscle|Sternocleidomastoid]]''': Weakness turning head to opposite side
* '''[[Trapezius muscle|Trapezius]]''': Shoulder droop, [[Scapular winging|scapular winging]], weakness of shoulder shrug
* '''[[Muscle atrophy|Atrophy]]''': May be present in chronic cases
'''Additional neurological examination''':<ref name="Cranial_Nerve_Testing"/>
* Assess other [[Cranial nerves|cranial nerves]] (IX, XII) to differentiate from related syndromes
* [[Cerebellum|Cerebellar]] function
* [[Motor function|Motor]]/[[Sensory function|sensory]] function (for brainstem involvement)
* [[Horner syndrome]] ([[Sympathetic nervous system|sympathetic]] involvement)
=== Laboratory Tests ===
=== Laboratory Tests ===
Guided by suspected etiology:<ref name="Ropper2019"/>
* '''[[Complete blood count|CBC]], [[Inflammatory marker|inflammatory markers]]''': [[Infection]], [[Inflammation]]
* '''[[Coagulation study|Coagulation studies]]''': If [[Vascular disease|vascular]] cause suspected
* '''[[Erythrocyte sedimentation rate|ESR]], [[C-reactive protein|CRP]], [[Antinuclear antibody|ANA]], [[Anti-neutrophil cytoplasmic antibodies|ANCA]]''': [[Autoimmunity|Autoimmune]]/[[Inflammation|inflammatory]]
* '''[[Lumbar puncture]]''': If [[Meningitis]], [[Demyelinating disease|demyelinating disease]], or [[Carcinomatous meningitis]] suspected
=== Imaging ===
=== Imaging ===
'''[[MRI|Magnetic resonance imaging]] brain and skull base''' (with [[Contrast agent|contrast]]):
* [[Imaging modality]] of choice
* Evaluate for:<ref name="Ropper2019"/><ref name="Wallenberg_Syndrome"/>
** [[Brainstem infarction|Brainstem infarction]]
** [[Demyelinating disease|Demyelinating lesions]]
** [[Mass lesion|Mass lesions]] (brainstem, skull base)
** [[Skull base]] pathology
'''[[Magnetic resonance angiography|MRA]] or [[CT angiography|CTA]]''':<ref name="Ropper2019"/>
* [[Vertebral artery dissection]]
* [[Aneurysm]]
* [[Vascular malformation]]
'''[[CT scan|CT skull base]]''':<ref name="Ropper2019"/>
* [[Bone erosion|Bony erosion]]
* [[Bone fracture|Fractures]]
* [[Jugular foramen]] expansion ([[Tumor]])
=== 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]]
* [[Collet Sicard Syndrome|Collet Sicard Syndrome]]
* [[Villaret Syndrome|Villaret Syndrome]]
* [[Tapia Syndrome|Tapia Syndrome]]
* [[Jackson Syndrome|Jackson Syndrome]]


These syndromes and their respective cranial nerve involvement are outlined in the table below.
'''Related [[Cranial nerve syndrome|cranial nerve syndromes]]''':<ref name="StatPearls_JuguarForamen"/><ref name="Ropper2019"/>
* '''[[Vernet syndrome|Vernet syndrome]] ([[Jugular foramen syndrome]])''': CN IX, X, XI
* '''[[Collet-Sicard syndrome]]''': CN IX, X, XI, XII
* '''[[Jackson syndrome]]''': CN X, XI, XII ([[Medulla oblongata|medullary]])
* '''[[Villaret syndrome]]''': CN IX, X, XI, XII + [[Horner syndrome|Horner]] ([[Retroparotid space|retroparotid]])
* '''[[Tapia syndrome]]''': CN X, XII ([[Extracranial]])


{| class="wikitable", style="margin-left: auto; margin-right: auto; border: none; text-align: center"
'''Other conditions''':<ref name="Bilateral_Vocal_Cord"/>
|+ Cranial Nerve Involvement in Skull Base Masses
* [[Vagal neuropathy|Isolated vagal neuropathy]]
|-
* [[Accessory neuropathy|Isolated accessory neuropathy]]
! Syndrome !! CN IX !! CN X !! CN XI !! CN XII !! Sympathetics
* [[Motor neuron disease|Motor neuron disease]] ([[Progressive bulbar palsy|progressive bulbar palsy]])
|-
* [[Myasthenia gravis]]
| Vernet Syndrome || ✔ || ✔ || ✔ || ||
|-
| Collet Sicard Syndrome || ✔ || ✔ || ✔ || ✔ ||
|-
| Villaret Syndrome || ✔ || ✔ || ✔ || ✔ || ✔
|-
| Tapia Syndrome || || ✔ || ± || ✔ || ±
|-
| Jackson Syndrome || || ✔ || ✔ || ✔ ||
|-
| Schmidt Syndrome || || ✔ || ✔ || ||
|}


== Management ==
== Management ==
=== Medical Management ===
=== Medical Management ===
'''Treatment depends on underlying etiology''':<ref name="Ropper2019"/>
'''Vascular ([[Stroke|stroke]])''':<ref name="Wallenberg_Syndrome"/>
* [[Antiplatelet drug|Antiplatelet therapy]], [[Statin]]
* [[Blood pressure]] management
* [[Stroke rehabilitation]]
'''[[Demyelinating disease]]''':<ref name="Ropper2019"/>
* [[Corticosteroid|Corticosteroids]] for [[Acute exacerbation|acute exacerbation]]
* [[Disease-modifying therapy|Disease-modifying therapy]]
'''[[Infection]]''':<ref name="Ropper2019"/>
* Appropriate [[Antimicrobial agent|antimicrobial therapy]]
'''[[Tumor]]''':<ref name="Ropper2019"/>
* [[Oncology|Oncologic]] treatment as appropriate
'''Supportive care''':<ref name="Aspiration_Pneumonia">Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Aspiration Pneumonia." ''StatPearls''. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK470459/</ref><ref name="Dysphagia_Management">Depippo KL, Logemann JA, Rademaker AW. "Dysphagia, dystussia, and aspiration pneumonia in elderly people." ''Journal of the American Geriatrics Society''. 1992;40(12):1244-1248.</ref>
* '''[[Dysphagia]] management''':<ref name="VFSS">Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Videofluoroscopic Swallowing Study (VFSS)." ''StatPearls''. NCBI Bookshelf; 2024.</ref>
** [[Speech-language pathology|Speech-language pathology]] evaluation
** [[Diet texture modification|Modified diet textures]]
** [[Swallowing therapy|Swallowing therapy]]
** [[Feeding tube]] if severe aspiration
* '''Voice therapy''': For [[Dysphonia|dysphonia]]
* '''[[Physical therapy]]''': For shoulder weakness
=== Surgical Management ===
=== Surgical Management ===
'''Depends on etiology''':<ref name="Ropper2019"/>
'''[[Tumor resection|Tumor resection]]''':<ref name="Skull_Base_Surgery">Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Jugular Foramen Tumors: Surgical Strategies." ''Neurosurgery''. 2024; In press.</ref>
* [[Skull base]] approaches for accessible tumors
* May require [[Multidisciplinary approach]] to care
'''[[Vocal fold medialization|Vocal fold medialization]]''':<ref name="Bilateral_Vocal_Cord"/>
* For persistent [[Vocal fold paralysis]]
* [[Injection laryngoplasty]] (temporary or permanent)
* [[Thyroplasty]] (permanent)
'''[[Pharyngeal surgery]]''':<ref name="Ropper2019"/>
* Rarely indicated
* [[Palatal adhesion]] or [[Pharyngoplasty]] for severe [[Velopharyngeal insufficiency]]


== Outcomes ==
== Outcomes ==
=== Complications ===
=== Complications ===
* '''[[Aspiration pneumonia]]''':<ref name="Aspiration_Pneumonia"/> Major concern with CN X dysfunction
* '''[[Malnutrition]]/[[Dehydration]]''': From [[Dysphagia]]
* '''Voice disability''': Social and occupational impact
* '''Shoulder dysfunction''': Reduced arm mobility
* '''Progression''': May occur depending on underlying cause
=== Prognosis ===
=== Prognosis ===
'''Varies by etiology''':<ref name="Ropper2019"/>
'''Vascular ([[Stroke|stroke]])''':<ref name="Wallenberg_Syndrome"/>
* Some recovery may occur over 6–12 months
* Degree of recovery depends on lesion extent
* [[Aspiration]] risk may persist
'''[[Tumor]]''':<ref name="Ropper2019"/>
* Depends on [[Tumor type]], [[Tumor resectability|resectability]], [[Cancer staging|stage]]
'''[[Demyelinating disease]]''':<ref name="Ropper2019"/>
* May recover with treatment
* Risk of [[Relapse|relapse]]
'''General considerations''':<ref name="Wallenberg_Syndrome"/><ref name="Dysphagia_Management"/>
* Early [[Diagnosis]] and treatment improve outcomes
* [[Swallowing therapy]] can reduce [[Aspiration]] risk
* [[Voice therapy]] and procedures can improve [[Phonation]]
* [[Multidisciplinary approach]] is essential


== References ==
== References ==
<references />
<references />
[[Category:Head and Neck]]
[[Category:Skull Base]]
[[Category:Cranial Nerve Disorders]]
[[Category:Brainstem Syndromes]]
[[Category:Neurological Disorders]]

Latest revision as of 01:09, 3 February 2026


Overview

Template:Clinical Caveat

Vagoaccessory syndrome (historically called "Schmidt syndrome" in neurological contexts) is a cranial nerve syndrome characterized by combined paralysis of cranial nerve X (vagus) and cranial nerve XI (accessory), with sparing of CN IX (glossopharyngeal).[1] The syndrome results in ipsilateral paralysis of the soft palate, pharynx, and larynx (vagus) along with weakness of the sternocleidomastoid and trapezius muscles (accessory nerve).[2]

Distinction from Vernet Syndrome

The key distinction of vagoaccessory syndrome from the more commonly described Vernet syndrome (jugular foramen syndrome) is the sparing of CN IX (glossopharyngeal):[3][4]

Vagoaccessory Syndrome vs Vernet Syndrome
Feature Vagoaccessory (Schmidt) Vernet Syndrome
CN IX Spared Affected
CN X Affected Affected
CN XI Affected Affected
Frequency Rare More common
Anatomical basis Selective brainstem or extracranial lesion Jugular foramen lesion (all nerves affected)

Anatomical paradox: Since CN IX, X, and XI all traverse the jugular foramen, isolated X-XI involvement with sparing of CN IX is anatomically unusual for jugular foramen pathology. This isolated pattern is more likely to occur with:[5]

  • Lesions of the nucleus ambiguus (brainstem), which provides motor fibers for CN X and the cranial portion of CN XI but not the sensory components of CN IX
  • Selective extracranial lesions affecting X and XI after they diverge from IX
  • Idiopathic cranial polyneuropathy with selective nerve involvement

Vagoaccessory syndrome is caused by lesions affecting the nucleus ambiguus (which gives rise to motor fibers for both CN X and the cranial portion of CN XI) or affecting both nerves along their course after separation from CN IX. Causes include brainstem lesions (stroke, demyelination, tumor) and selective Skull base pathology.[6]

History

Template:Evidence Note

The neurological "Schmidt syndrome" is attributed to Adolf Schmidt (1865–1918), a German physician who reportedly described the combination of vagus and accessory nerve paralysis, potentially in 1892. However, this historical claim requires verification, as contemporary literature searches do not readily confirm this specific attribution.

The medulla contains a concentration of cranial nerve nuclei in a small area, making it susceptible to producing distinct clinical syndromes when affected by focal lesions. The late 19th and early 20th centuries saw extensive efforts to map specific brainstem syndromes to anatomical locations, including:[1]

  • Wallenberg syndrome (1895): Lateral medullary infarction
  • Vernet syndrome (1918): Jugular foramen syndrome (CN IX-X-XI)
  • Collet-Sicard syndrome (1915/1917): CN IX-X-XI-XII

The isolated combination of CN X and XI palsy (vagoaccessory syndrome) is less commonly described than Vernet syndrome in both historical and contemporary literature, likely because most jugular foramen lesions affect CN IX along with X and XI.[4]

Pathophysiology

Relevant Anatomy

Anatomical basis for combined CN X and XI involvement:[7]

Nucleus ambiguus:[6]

Spinal accessory nucleus:[8]

Course of cranial nerves X and XI:[2]

Vagus nerve (X):[7]

Accessory nerve (XI):[8]

  • Cranial root: From nucleus ambiguus; joins vagus to supply laryngeal muscles
  • Spinal root: From cervical spinal cord; provides motor to Template:Nobr and trapezius
  • Both roots exit skull through jugular foramen
  • Spinal root continues to muscles; cranial root joins vagus

Location of combined lesions:[9]

Lesions causing Schmidt syndrome may occur at:

  1. Nucleus ambiguus: Medullary lesion affecting both nuclei
  2. Intracranial course: Near jugular foramen
  3. Jugular foramen: Where CN X and XI pass together
  4. Extracranial course: After exiting jugular foramen

Disease Etiology

Brainstem lesions (most likely to produce isolated X-XI involvement):[9][1]

Brainstem lesions affecting the nucleus ambiguus are the most likely etiology for true isolated X-XI palsy with IX sparing, since the nucleus ambiguus provides motor output for X and the cranial root of XI, while CN IX has separate sensory nuclei.

Skull base lesions:[2][10]

Most jugular foramen tumors produce Vernet syndrome (CN IX-X-XI) rather than isolated X-XI involvement. Selective X-XI involvement may occur with:

Trauma:[1][15][16]

Vascular:[9][17][18]

Infectious/Inflammatory:[1][3]

Idiopathic:[19]

  • Idiopathic cranial polyneuropathy—may present with selective lower cranial nerve involvement; pediatric cases may recover completely with corticosteroids[19]

Diagnosis

Patient History

Symptoms reflect CN X and XI dysfunction:[7][9]

Vagus nerve (X) symptoms:[20]

Accessory nerve (XI) symptoms:[8]

  • Shoulder droop: Weakness of trapezius
  • Difficulty elevating arm: Above horizontal plane
  • Weakness turning head: To contralateral side (Template:Nobr weakness)
  • Neck/shoulder pain: From muscle weakness

Associated symptoms depend on etiology:[1]

Physical Examination

Cranial nerve X examination:[7][21]

Accessory nerve (XI) examination:[8]

Additional neurological examination:[21]

Laboratory Tests

Guided by suspected etiology:[1]

Imaging

Magnetic resonance imaging brain and skull base (with contrast):

MRA or CTA:[1]

CT skull base:[1]

Differential Diagnosis

Related cranial nerve syndromes:[2][1]

Other conditions:[20]

Management

Medical Management

Treatment depends on underlying etiology:[1]

Vascular (stroke):[9]

Demyelinating disease:[1]

Infection:[1]

Tumor:[1]

Supportive care:[22][23]

Surgical Management

Depends on etiology:[1]

Tumor resection:[25]

Vocal fold medialization:[20]

Pharyngeal surgery:[1]

Outcomes

Complications

Prognosis

Varies by etiology:[1]

Vascular (stroke):[9]

  • Some recovery may occur over 6–12 months
  • Degree of recovery depends on lesion extent
  • Aspiration risk may persist

Tumor:[1]

Demyelinating disease:[1]

  • May recover with treatment
  • Risk of relapse

General considerations:[9][23]

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 Ropper AH, Samuels MA, Klein JP, Prasad S. Adams and Victor's Principles of Neurology. 11th ed. McGraw-Hill; 2019.
  2. ↑ 2.0 2.1 2.2 2.3 Tubbs RS, Loukas M, Cohen-Gadol AA. "Anatomy, Head and Neck: Jugular Foramen." StatPearls. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK538507/
  3. ↑ 3.0 3.1 3.2 Ferreira J, Franco A, Teodoro T, Coelho M, Albuquerque L. Vernet syndrome resulting from varicella zoster virus infection—a very rare clinical presentation of a common viral infection. J Neurovirol. 2018;24(6):772-775. doi:10.1007/s13365-018-0674-4
  4. ↑ 4.0 4.1 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):S271-S293. doi:10.1016/j.jacr.2022.09.012
  5. ↑ Ong CK, Chong VF. The glossopharyngeal, vagus and spinal accessory nerves. Eur J Radiol. 2010;74(2):359-367. doi:10.1016/j.ejrad.2009.08.004
  6. ↑ 6.0 6.1 Tubbs RS, Loukas M, Khalili M, Khalili N, Cohen-Gadol AA. "Neuroanatomy, Nucleus Ambiguus." StatPearls. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK547744/
  7. ↑ 7.0 7.1 7.2 7.3 National Institutes of Health. "Cranial Nerves IX and X: The Glossopharyngeal and Vagus Nerves." Clinical Methods: The History, Physical, and Laboratory Examinations. 3rd ed. NCBI Bookshelf; 1990. https://www.ncbi.nlm.nih.gov/books/NBK386/
  8. ↑ 8.0 8.1 8.2 8.3 Tubbs RS, Loukas M, Khalili M, Khalili N, Cohen-Gadol AA. "Neuroanatomy, Cranial Nerve 11 (Accessory)." StatPearls. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK507722/
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 9.7 Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Lateral Medullary Syndrome (Wallenberg Syndrome)." StatPearls. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK551670/
  10. ↑ Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Glomus Jugulare." StatPearls. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK560489/
  11. ↑ Oushy S, Graffeo CS, Perry A, et al. Collet-Sicard syndrome attributable to extramedullary plasmacytoma of the jugular foramen. World Neurosurg. 2018;115:47-51. doi:10.1016/j.wneu.2018.04.008
  12. ↑ Mutlu V, Ogul H. Magnetic resonance imaging features of Collet-Sicard syndrome associated with glomus jugulare paraganglioma. J Craniofac Surg. 2019;30(3):e250-e252. doi:10.1097/SCS.0000000000005275
  13. ↑ Kang K, Moon BG. Developmental abnormalities of the craniocervical junction resulting in Collet-Sicard syndrome. Spine J. 2016;16(2):e59-e62. doi:10.1016/j.spinee.2015.08.058
  14. ↑ Le AQ, Walcott BP, Redjal N, Coumans JV. Cervical osteophyte resulting in compression of the jugular foramen: case report. J Neurosurg Spine. 2014;20(4):429-433. doi:10.3171/2013.12.SPINE13666
  15. ↑ Alberio N, Cultrera F, Antonelli V, Servadei F. Isolated glossopharyngeal and vagus nerves palsy due to fracture involving the left jugular foramen. Acta Neurochir (Wien). 2005;147(7):787-789. doi:10.1007/s00701-005-0539-y
  16. ↑ Coello AF, Canals AG, Gonzalez JM, Martín JJ. Cranial nerve injury after minor head trauma. J Neurosurg. 2010;113(3):547-555. doi:10.3171/2010.6.JNS091620
  17. ↑ 17.0 17.1 Lee M, Heo Y, Kim T. Vernet's syndrome associated with internal jugular vein thrombosis. J Stroke Cerebrovasc Dis. 2019;28(8):e104-e106. doi:10.1016/j.jstrokecerebrovasdis.2019.04.028
  18. ↑ 18.0 18.1 Daley NC, Colliver EB. A case of Vernet syndrome associated with internal jugular phlebectasia. PM R. 2014;6(9):857-860. doi:10.1016/j.pmrj.2014.02.016
  19. ↑ 19.0 19.1 Yoshihara N, Okuda M, Takano K, Wada T, Osaka H. Idiopathic cranial polyneuropathy with unilateral IX and X and contralateral XI nerve palsy in a 4-year-old boy. Pediatr Neurol. 2012;46(4):263-265. doi:10.1016/j.pediatrneurol.2012.01.014
  20. ↑ 20.0 20.1 20.2 Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Bilateral Vocal Cord Paralysis." StatPearls. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK560852/
  21. ↑ 21.0 21.1 Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Cranial Nerve Testing." StatPearls. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK585066/
  22. ↑ 22.0 22.1 Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Aspiration Pneumonia." StatPearls. NCBI Bookshelf; 2024. https://www.ncbi.nlm.nih.gov/books/NBK470459/
  23. ↑ 23.0 23.1 Depippo KL, Logemann JA, Rademaker AW. "Dysphagia, dystussia, and aspiration pneumonia in elderly people." Journal of the American Geriatrics Society. 1992;40(12):1244-1248.
  24. ↑ Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Videofluoroscopic Swallowing Study (VFSS)." StatPearls. NCBI Bookshelf; 2024.
  25. ↑ Tubbs RS, Loukas M, Khalili M, Khalili N, Cesmebasi A, Cohen-Gadol AA. "Jugular Foramen Tumors: Surgical Strategies." Neurosurgery. 2024; In press.
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