Transitional cell carcinoma (TCC) of the renal pelvis and upper uncommon, accounting for only 7% of all primary tumors of the kidney.Tumor thrombus of transitional cell carcinoma invading reported.

• 摘要肾移形细胞癌并不常见，约只佔肾原发性肿瘤百分之七，若有肾移形细胞癌侵犯下腔静脉并有肿瘤栓塞发生则更为罕见，至今仅有十九例在世界文献被报告过。