Primary Malignant Renal Tumors in Infancy and Childhood: CT Appearances

Abstract

Objective: To investigate the imaging manifestation of primary malignant renal tumor with CT. Methods: Forty-three cases of surgically and pathologically confirmed primary malignant renal tumor were retrospectively reviewed. Un-contrast and contrast CT was performed in all 43 patients in which 15 patients received MRI examination. Results: The residual normal renal tissue of 29 cases out of 34 cases of Wilms' tumor was enhanced and manifested "crescent sign" or "ring sign". Four cases of malignant rabdoid tumor (RTK) manifested as large mass with notable necrosis and subcapsular fluid collection; Two cases of clear cell sarcoma (CCS) showed metastases to the skull which could indicate the diagnosis; Renal cell carcinoma (RCC) (n=3) showed calcification in 1 case. Conclusion: CT can precisely delineate the location, size, extent of involvement, imaging characteristics and metastases of renal tumor, which can provide information necessary to the clinical staging, therapy planning and prognosis of the tumors.