Spontaneous CSF Otorrhea Caused by Abnormal Development of the Facial Nerve Canal
Leonard V. Petrus
,a and
W. W. M. Loa
a From the Department of Radiological Sciences, Olive View-UCLA Medical Center, Sylmar, CA (L.V.P.), and the Department of Radiology, St. Vincent Medical Center, Los Angeles, CA (W.W.M.L.).
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FIG 1. A–C, 34-year-old man with three episodes of meningitis over the course of 1 year. High-resolution coronal temporal bone CT scans of the right ear show smooth enlargement of the right geniculate fossa (arrow, A) and of the labyrinthine facial nerve canal (arrow, B), and a normal labyrinthine facial nerve canal of the left ear (arrow, C)
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FIG 2. 5-year-old boy in whom myringotomy had been performed to correct left-sided otitis media.
A and B, Axial CT scans of the temporal bones show enlarged left geniculate fossa (arrow, A) and enlarged tympanic facial nerve canal (arrows, B).
C, Coronal T2-weighted MR image shows an area of high signal intensity, consistent with CSF superior to the cochlea in the region of the left geniculate fossa (arrow).
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