AJDRAJNR - American Journal of Neuroradiology

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ARTICLE

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.).

Summary: In two patients with surgically proved CSF fistula through the facial nerve canal, MR and CT examinations showed smooth enlargement of the geniculate fossa with CSF signal. In the clinical setting of CSF otorrhea or rhinorrhea, the presence of an enlarged labyrinthine facial nerve canal and enlarged geniculate fossa on CT scans and CSF intensity on MR images strongly suggests a CSF fistula through the facial nerve canal.