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Calcified transitional cell carcinoma of the renal pelvis.

Six patients with calcified transitional cell carcinoma of the renal pelvis were encountered over a 10-year period, and the radiographic features in these cases are presented. Radiographically discernible calcification is one of the less common manifestations of this lesion, and the pattern of calcification may be variable. However, the combination of a coarse, punctate pattern with a mucosal lesion on excretory or retrograde urography should suggest the diagnosis and prompt further investigation.