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AJNR - American Journal of Neuroradiology

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Jacobson's Nerve Schwannoma Presenting as Middle Ear Mass

Kubilay Aydin^a, Menahem M. Maya^,a, William W.M. Lo^a, Derald E. Brackmann^a and Bradley Kesser^a

^a From the Department of Radiology (K.A.), Hacettepe University Hospitals, Ankara, Turkey; and the Departments of Radiology (M.M.M., W.W.M.L.) and Surgery (D.E.B., B.K.), St. Vincent Medical Center, Los Angeles, CA.

View larger version (151K): [in a new window]   FIG 1. Axial unenhanced CT scan shows a well-circumscribed mass (M) in the tympanic cavity. Note the erosion of the cochlear promontory (arrow).FIG 2. Coronal unenhanced CT scan shows the mass confined to the tympanic cavity. Note the normal-sized tympanic segment of the facial nerve canal (arrow).FIG 3. A, Axial unenhanced T1-weighted image shows a tympanic mass (arrow) that is isointense to brain parenchyma (500/10/2 [TR/TE/excitations]); B, Axial contrast-enhanced T1-weighted image reveals intense, homogeneous enhancement of the mass (arrow) (500/10/2)

View larger version (80K): [in a new window]   FIG 4. Axial photomicrograph of a normal temporal bone specimen shows the Jacobson's nerve adjacent to the cochlear promontory (arrow). Note the stapes footplate (open arrow), and the facial nerve (F).FIG 5. Axial unenhanced CT scan shows normal-sized inferior canaliculus (arrows). Note the glomus typanicum (arrowhead)