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Radiology Forum
February 2001

Diagnosis Quiz Case 2

Author Affiliations

Copyright 2001 American Medical Association. All Rights Reserved. Applicable FARS/DFARS Restrictions Apply to Government Use.2001

Arch Otolaryngol Head Neck Surg. 2001;127(2):215-216. doi:

Unenhanced coronal (Figure 1) and axial (Figure 2) computed tomograms demonstrate marked enlargement of the fallopian canal in both its horizontal (tympanic) portion (Figure 1) and its vertical (mastoid) segment (Figure 2).

Neoplastic involvement of the seventh nerve is the cause of facial palsy in approximately 5% of cases.1 Direct or indirect pressure on the nerve may result from expanding central nervous system masses, such as congenital cholesteatoma, meningioma, and glioma, as well as from malignant local tumors and metastatic disease. Tumors of the nerve sheath itself include facial nerve neuroma and neurofibroma, which may be readily differentiated histologically.