Renal malignancies with normal excretory urograms

Four patients with malignant renal masses showed no abnormality on excretory urograms with tomography. Of the four lesions, two were primary renal cell carcinomas, one was a metastatic focus from a contralateral renal cell carcinoma, and one was a metastatic lesion from rectal adenocarcinoma. A normal excretory urogram should not be considered sufficient to exclude a clinically suspected malignant renal mass. In such an instance, diagnostic evaluation should be pursued using a method capable of topographic anatomic display, such as computed tomography or sonography.
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				C Fowler and R H Reznek The indeterminate renal mass Imaging, April 1, 2001; 13(1): 27 - 43. [Full Text]