A normal technetium-99m-DTPA renogram in renal cell carcinoma: a case report.

: A 64-yr-old man with a renal mass had a preoperative 99mTc-DTPA renal flow study and renogram. An area of minimally relative increase in flow in the upper half of the right kidney was thought to reflect the high vascularity of the renal mass. A subsequent renogram showed no mass defect in the area of relatively high flow of the right kidney. The patient had a right nephrectomy. The removed kidney showed an extrarenal mass measuring 6 x 5.5 x 5 cm at the upper pole of the kidney. The mass was confirmed to be a renal cell carcinoma, clear cell type. There was no renal tissue invasion. These finding suggest an extrarenal mass pattern may be difficult to identify with a normal appearing renogram.