Abstract
Pineal parenchymal tumours (PPTs) represent one third of the pineal region tumours. PPTs are subdivided into pineocytoma (PC), pineoblastoma (PB) and PPT with intermediate differentiation (PPTID). We report radiological, morphological and immunochemical features which permit to grade these tumours. Tumors of the pineal region can arise from multiple cellular origins and thus represent a very heterogeneous group of pathologies.Within the subgroup of pineal parenchymal tumors, there is a histopathologic spectrum ranging from pineocytoma to pineal parenchymal tumors of intermediate differentiation to pineoblastoma. The currentWorld Health Organization classification and the histopathologic features of the pineal parenchymal tumor subtypes with intermediate differentiation are described. Keywords: Pineal parenchymal tumours, Pineal parenchymal tumours with, Intermediate differentiation, Pineoblastoma and Pineocytoma.
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