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Washington University Experience | NEOPLASMS (PINEAL) | Pineocytoma | 11E Pineocytoma, pleomorphic variant (Case 11) Ki67 20X 1
Ki-67 highlights a proliferation index of 2.5%. ---- Comment: These histomorphological and immunohistochemical findings support the diagnosis: Pineocytoma, pleomorphic variant WHO Grade I. The pleomorphic variant of pineocytoma reflects the marked nuclear atypia within the tumor cells, albeit in a background of low proliferation indices, and does not have any prognostic significance.
