Abstract: Objective To study the feature of CT in renal pelvis transitional cell carcinoma and evaluate the diagnosis value in transitional cell carcinoma of renal pelvis with CT.Methods A report of 32 cases with transitional cell carcinoma of renal pelvis proved by surgery and pathology.The examinations were performed with CT scan before the operation, finally, a sensitivity analysis was performed.Results In the 32 cases:15 cases, soft tissue was observed, the diameters were 1.5-4.0cm, in renal pelvis and calyx, the displacement or amputation of renal sinus fat line and thinning, with the clearance;8 cases, soft tissue was observed, the diameters were 4.1-9.0cm, in renal pelvis and calyx, involved the renal hilum, the disappearance of the renal sinus fat clearance;in 4 cases, invasive growing along the renal pelvis wall, abnormal thickening of the renal pelvis walls, from the renal hilum to upper end of ureter, the mild dilated and hydrops in the renal pelvis and calyx;in 5 cases, invasion of the renal essence and adjacent tissues, inhomogeneous tumor in density were formed, it was difficult to distinguish the renal pelvis, renal calyx and renal essene, the lymph node increased in renal hilum and retroperitonal.In the 32 cases:CT plain scan, CT Value33-50Hu, 25 cases isodense, 4 cases lightly high density, 3 cases slightly low density;21 cases even density, 11cases uneven density, 5cases hemorrhagic focus of tumor, 5 cases calcification of tumor, 3cases necrosis and cystic lesions of tumor.21 cases CT enhanced scan could reveal the light to moderate enhancement of the tumor, 13 cases were enhanced even slightly, 8 cases were enhanced uneven slightly of the tumor on cortex stage;there was no significant change in the parenchymal phase and renal pelvis phase compared with cortex stage in the contrast-enhanced.In the 32 cases:the 21 cases were determined and the 7 cases were suspected, the 2 cases were misdiagnosed and the 2 cases were normal.Conclusion the main sign was isodense in plain scan and enhanced scan of CT for transitional cells carcinoma of renal pelvis, CT has heigher diagnostic sensitivity and accuracy on finding and qualitation.

Key words: Renal pelvis, Transition cell carcinoma, X-ray computed