Document Detail

Infranuclear facial palsy: importance of imaging the geniculate fossa.
MedLine Citation:
PMID:  22801039     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To highlight the importance of imaging the geniculate fossa in patients with solitary infranuclear facial palsy.
STUDY DESIGN: Prospective.
SETTING: Tertiary referral center.
ELIGIBILITY CRITERIA: Patients with solitary infranuclear facial palsy sent for imaging.
MAIN OUTCOME MEASURE: Imaging specifics concerning high-resolution computed tomography (HRCT) and magnetic resonance imaging (MRI) are described in detail for evaluation of the intratemporal part of the facial nerve with special focus on the geniculate fossa.
RESULTS: Normal appearances of the geniculate fossa on HRCT and MRI and its normal anatomic variant, that is, dehiscence of the overlying bone are described. Imaging findings in a range of pathologies involving the geniculate fossa in a clinical setting of infranuclear facial nerve palsy is demonstrated. These include infections (tuberculosis), trauma, schwannoma, hemangioma, meningioma, and perineural spread of parotid malignancy.
CONCLUSION: The geniculate fossa is a small bony hiatus in the temporal bone and is situated at the junction of the labyrinthine and the tympanic segments of the intratemporal facial nerve canal. It houses important neural structures and is best visualized by a combination of HRCT and high-resolution MRI examination of the temporal bone. It is therefore imperative for imaging specialists to be familiar with the normal appearance of this structure on HRCT and MRI examinations of the temporal bone as subtle imaging findings involving the geniculate fossa can be indicators of a variety of abnormalities.
Sanjay Vaid; Neelam Vaid; Santosh Rathod
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology     Volume:  33     ISSN:  1537-4505     ISO Abbreviation:  Otol. Neurotol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-09-13     Completed Date:  2013-02-01     Revised Date:  2013-11-06    
Medline Journal Info:
Nlm Unique ID:  100961504     Medline TA:  Otol Neurotol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1430-8     Citation Subset:  IM    
Department of Radiology and Imaging, Grant Medical Foundation, KEM Hospital, Pune, India.
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MeSH Terms
Cochlea / pathology
Facial Paralysis / diagnosis,  pathology*
Geniculate Ganglion / injuries,  pathology*
Hemangioma / pathology
Magnetic Resonance Imaging
Meningioma / pathology
Neurilemmoma / pathology
Parotid Neoplasms / pathology
Skull Neoplasms / pathology,  secondary
Temporal Bone / injuries,  pathology*
Tomography, X-Ray Computed
Tuberculosis, Osteoarticular / pathology

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