Fig. 2

Histological features of the current case. a: The low magnification of the whole slide showed the tumor with a relatively clear boundary. b-e: The tumor composed of highly vascular area, cellular area and paucicellular area. f-h: In all three regions, tumor cells with clear cytoplasm could be observed. The arrows indicated the giant tumors. i: Foci of spindly and bipolar cells resemble tanycytes were observed within the tumor. j: Spindly, bipolar elements may exist in the midst of the cellular nest surrounding by the clear cells. k: Nuclei of these cells in the midst exhibited the salt and pepper speckling. The arrows indicated the giant tumors indicated the area of tanycytic variant. l: Foci of giant tumor cells with marked pleomorphism. The arrows indicated the giant tumors