Figure 1

Pathological characteristics of the patient. A) High-power photomicrograph of the lesion, eight years previously, which was diagnosed as medulloblastoma (H & E, 200×). B) High-power photomicrograph showing proliferation of pleomorphic spindle-shaped cells having large irregular nuclei with hyperchromasia (H & E, 200×). C-I) Photomicrograph of tumor with immunohistochemical stain (200×). C) Vimentin demonstrating a strongly positive reaction in the tumor cells. D) CD68 demonstrating a strongly positive reaction in the tumor cells. E) Fibronectin (FN) demonstrating a strongly positive reaction in the tumor cells. F) Desmin showing negative reaction in the tumor cells. G) S-100 showing negative reaction in the tumor cells. H) Cytokeratins showing negative reaction in the tumor cells. I) Ki-67 (MIB-1) demonstrating positive reaction in the tumor cells. The MIB-1 labeling index is 10%.