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A mildly T2 hyperintense, T1 isointense and homogeneously enhancing mass with mild diffusion restriction arises from a broad dural base along planum sphenoidale and diaphragma sellae. The mass indents the posteroinferior frontal lobes, effaces the third ventricle and posteroinferiorly displaces the pituitary infundibulum. There is no evidence of extension into the pituitary fossa, cavernous sinuses or orbital apex.
The prechiasmatic optic nerves are flattened and bowed around the lateral periphery of the mass, and the optic chiasm is severely compressed at its posterior margin.
Supraclinoid ICAs are abutted medially but not encased by tumor, and the anterior cerebral artery A1 segments are draped over the posterosuperior margin.
No extradural enhancing lesion is identified. Brain parenchyma demonstrates normal signal with no diffusion restriction or pathological enhancement. No hydrocephalus.
Morphology and signal characteristics of the large mass arising from planum sphenoidale and diaphragma sellae are consistent with a meningioma.
Severe displacement and compression of the optic chiasm and prechiasmatic optic nerves, which are stretched around the lateral and posterior margins of the mass.
The patient went on to have the mass resected.
MICROSCOPIC DESCRIPTION: Paraffin sections show fragments of a moderately hypercellular meningioma with a dural attachment. Also included are fragments of refractile foreign material. The tumor has a well developed syncytial architecture. Tumor cells have uniform nuclear features. No mitotic figures or areas of necrosis are identified and there is no evidence of brain invasion.
DIAGNOSIS: Meningioma (WHO Grade I).