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

Figure 4

Histopathological findings of resected specimens. (a) Neurofibroma of the facial nerve in the mastoid segment of the osseous canal (Haematoxylin and Eosin stain; original magnification ×20). (b) Photomicrograph at higher power showing that the tumor is composed of cells with thin, elongated nuclei and scant cytoplasm, embedded in a myxoid stroma. Note that there is no evidence of malignancy (Haematoxylin and Eosin stain; original magnification ×200).

(a)

(b)