Extratemporal Malignant Nerve Sheath Tumor of Facial Nerve with Coexistent Intratemporal Neurofibroma Mimicking Malignant Intratemporal Extension

Figure 3

Axial CT images of the right temporal bone. (a) A mass in the stylomastoid foramen (large arrow) is destroying the tympanic bone and mainly spreading outside the bone (arrow heads). Note that, additionally, there is bony destruction on the inward side that might have spread along small branches of the facial nerve (small arrows). (b) The bony canal of the mastoid segment of the facial nerve is enlarged (arrow). (c) The bony canal of tympanic segment of the facial nerve is enlarged (arrow) as compared with the contralateral normal side (not shown).

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