Figure 2

Removed kidney and pathology of the tumor. (A) The tumor was solid, elastic soft, and light yellow in coloration, with degenerative necrosis, hemorrhage and cystic lesion apparent inside the tumor. The resected kidney weighed 630 g. The borders of the normal kidney were clear (arrow: normal kidney). (B) This part of the tumor exhibited clear cells with scant cytoplasm and circular. Nuclei, suggesting clear cell sarcoma of the kidney (CCSK). Hematoxylin-eosin staining (reduced from × 400). (C) This part of the tumor showed spindle-shaped cells with a comparatively high nucleus to cytoplasm ratio. These findings suggested SSK or spindle-pattern CCSK. Hematoxylin-eosin staining (reduced from × 400).