Results Histopathologic study confirms the diagnosis of giant cell tumor of kidney mixed with transitional cell carcinoma and immunohistochemistry denotes that the sarcoma is of mesenchymal origin and the carcinoma of epithelial origin. 结果病理检查证实该肿瘤为巨细胞肉瘤与移行细胞癌的混合性肿瘤,免疫组织化学提示肉瘤来源于间质,而癌部分来源于上皮。