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Figure 3: (a) Axial computed tomography of the bone window of the petrous temporal bone shows significant destruction (arrow) of the left posterior petrous ridge extending to the mastoid. (b) Axial magnetic resonance imaging T1 sequence shows a lobulated extra-axial isointense lesion (arrow) with few areas of intralesional signal void and peripheral rim of hypointensity in the region of the endolymphatic sac. (c) Axial magnetic resonance imaging T2 sequence shows the heterointensity of the extra-axial lesion (arrow) and the rim of peripheral hypointensity. (d) Histologic section shows a neoplasm composed of broad papillary configurations lined by a single layer of cuboidal epithelium with fibrovascular stroma

Figure 3: (a) Axial computed tomography of the bone window of the petrous temporal bone shows significant destruction (arrow) of the left posterior petrous ridge extending to the mastoid. (b) Axial magnetic resonance imaging T1 sequence shows a lobulated extra-axial isointense lesion (arrow) with few areas of intralesional signal void and peripheral rim of hypointensity in the region of the endolymphatic sac. (c) Axial magnetic resonance imaging T2 sequence shows the heterointensity of the extra-axial lesion (arrow) and the rim of peripheral hypointensity. (d) Histologic section shows a neoplasm composed of broad papillary configurations lined by a single layer of cuboidal epithelium with fibrovascular stroma