title: Hemiatrophy of the tongue caused by an extensive vagus nerve schwannoma masquerading as a carotid chemodectoma.
abstract: BACKGROUND
  Carotid chemodectomas or carotid body tumors are rare neoplasms, generally benign and frequently asymptomatic, which represent 0.6 % of all head and neck tumours. Schwannomas or neurilemmomas are benign, slow growing tumours that derive from the sheath of peripheral and cranial nerves. Of all neurilemmomas, 25-45 % originate from the head and neck region, with the vagus nerve being one the most encountered sites of occurrence.
  
  
  METHODS
  We describe a schwannoma originating from the vagus nerve mimicking a carotid body tumour and compromising the function of the hypoglossal nerve.
  
  
  CONCLUSIONS
  Patients with lateral neck masses near the bifurcation of the carotid artery are often referred to the maxillofacial surgeon. The differential diagnosis of these lesions includes a variety of tumours among which carotid chemodectomas and vagus nerve schwannomas have a significant incidence. Both lesions may appear as completely asymptomatic, thus it is very difficult to identify the origin of the tumour based on physical examination. In making a differential diagnosis of the cervical tumours imaging studies play a key role.
  
  
  OBJECTIVE
  A diagnostic algorithm based on contemporary imaging modalities, which can be useful in order to distinguish between these two pathological entities is presented.
authors.affiliation: K.A.T General Hospital of Attica, Athens, Greece.
authors.forename: George
authors.initials: G
authors.lastname: Rallis
authors.affiliation: K.A.T General Hospital of Attica, Athens, Greece.
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Mourouzis
authors.affiliation: K.A.T General Hospital of Attica, Athens, Greece.
authors.forename: Chrysostomos
authors.initials: C
authors.lastname: Maltezos
authors.affiliation: K.A.T General Hospital of Attica, Athens, Greece ; Flat 11, Gorse House, Medley Court, EX4 2QJ Exeter, UK.
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Stathopoulos
keywords: Carotid chemodectoma; Hemiatrophy of the tongue; Vagus nerve schwannoma
references.citation: Laryngoscope. 2004 Dec;114(12):2210-3
references.pmid: 15564847
references.citation: J Laryngol Otol. 2000 Feb;114(2):119-24
references.pmid: 10748827
references.citation: Head Neck. 1996 Jan-Feb;18(1):67-77
references.pmid: 8774924
references.citation: Acta Otorrinolaringol Esp. 2007 Mar;58(3):94-100
references.pmid: 17371691
references.citation: Ann Otol Rhinol Laryngol. 2004 Sep;113(9):696-9
references.pmid: 15453525
references.citation: Acta Neurol Taiwan. 2007 Mar;16(1):37-40
references.pmid: 17486732
references.citation: Arch Otolaryngol Head Neck Surg. 2007 Jul;133(7):662-7
references.pmid: 17638778
references.citation: Ann Otol Rhinol Laryngol. 2001 Jan;110(1):36-40
references.pmid: 11201806
references.citation: Surg Neurol. 2006 Apr;65(4):397-401, discussion 401
references.pmid: 16531208
references.citation: Laryngoscope. 1996 Dec;106(12 Pt 1):1548-52
references.pmid: 8948621
references.citation: Auris Nasus Larynx. 2007 Sep;34(3):353-9
references.pmid: 17376620
references.citation: Vascular. 2009 Jul-Aug;17(4):222-5
references.pmid: 19698304
references.citation: Neurosurgery. 2000 Jun;46(6):1498-503
references.pmid: 10834653
references.citation: Yonsei Med J. 2010 Nov;51(6):938-42
references.pmid: 20879063