抄録
The author presented a story how he had found and named“clear cell ependymoma (CCE).”It happened in 1982 when a 22 years old man was operated for a right frontal tumor. The initial pathologic diagnosis was oligodendroglioma, which was not satisfactory for the author because the the tumor was well enhanced in CT scan. After looking many times of the specimen by microscope, the author found a limited portion where tumor cells arranged around blood vessels and extended their processes toward blood vessel walls. Then done was the immunostain for GFAP and electron microscopic examination which revealed glial and epithelial nature of the tumor cells. The second case of CCE originated from the cerebellum of which the initial diagnosis was hemangioblastoma. The case was presented with interesting episodes. Finally, the author stressed the significance of CCE in cases when the tumor tissue consists mostly of clear cells. Antigen retrieval of EMA in the course of pathologic diagnosis is strongly recommended.
