J Korean Radiol Soc.  1994 Dec;31(6):1137-1141.

CT Differentiation of Infiltrating Renal Cell Carcinoma and Renal Urothelial Tumor

• Lee MG
• Auh YH
• Cho KS
• Goo DE
• Bang SW
• Choi HK

Abstract

PURPOSE
It may be difficult to differentiate renal cell carcinoma involving collecting system from renal urothelial tumor invading into renal parenchyma. The purpose of this study was to assess the differences of CT findings between two conditions.
MATERIALS AND METHODS
CT findings of 5 cases of renal cell carcinoma involving the renal collecting systems and 10 cases of renal urothelial tumors invading the renal parenchyma were compared, and analyzed about the presence or absence of hydronephrosis, normal or abnormal CT nephrogram, renal contour changes due to mass and tentative diagnosis. The diagnoses were confirmed at surgery.
RESULTS
Renal cell carcinoma showed hydronephrosis in only 20% and normal CT nephrogram and outward contour bulging in all cases. In contrast, renal urothelial tumor showed hydronephrosis(70%), abnormal CT nephrogram(60%), and preservation of reniform shape(100%).
CONCLUSION
Renal contour changes and CT nephrogram may be useful in distinguishing both disease entities.

MeSH Terms

Carcinoma, Renal Cell*
Diagnosis
Hydronephrosis