Pineal parenchymal tumor of intermediate differentiation


Try as one might, sometimes pathologists just split diagnoses too much to allow for accurate pre-op diagnosis. In this case the tumor was indeed a pineal parenchymal tumor, but did not quite make it to a pineoblastoma, rather only a pineal parenchymal tumor with intermediate differentiation (WHO Grade III).

The location of the internal cerebral veins running through the tumor precluded safe complete excision.