Hypercellular meningothelial neoplasm. The tumor exhibits a predominant solid, sheet-like growth pattern, with areas lacking classic whorled architecture. The neoplastic cells shows syncytial cytoplasm and demonstrate marked cytologic atypia, including nuclear pleomorphism, hyperchromasia, an increased nuclear-to-cytoplasmic ratio, and prominent macronucleoli. Mitotic activity is readily identified. Foci of glial tissue infiltrated by the tumor are noted. There is no evidence of spontaneous coagulative tumor necrosis in the examined tissue.
Known history of an intracranial tumor presenting for histopathological evaluation of an irregular, extra-axial, dural-based mass located at the junction of the left temporoparietal region, which has shown interval increase in size compared to previous imaging and exhibits imaging characteristics (heterogeneous signal, solid enhancement, and dural tail) suspicious for atypical meningioma versus other aggressive extra-axial tumors such as hemangiopericytoma.
Soft tissue fragments collectively measured 2.2x1.8x0.7 cm, totally embedded.
Left temporoparietal region extra-axial dural-based mass, biopsy: