Computerized tomography has been used in the evaluation of 5 patients with radiolucent masses of the collecting system. There were 3 cases of renal calculi, 1 peripelvic cyst and 1 squamous cell carcinoma of the renal pelvis. The results of computerized tomography scanning are correlated with the results of excretory urography and ultrasonographic scanning. The diagnostic advantage of computerized tomography scanning for evaluation of radiolucent masses of the upper collecting system is elucidated.
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