Adenocarcinoma of the renal parenchyma.

The classic triad of hematuria, flank pain and abdominal mass is present in only 15 percent of patients with adenocarcinoma of the kidney. In one-third of patients, metastases are present at the time the tumor is discovered. Contour abnormalities of the kidney, displacement of portions of the collecting system and altered axis of the kidney may be seen on intravenous pyelogram. The presence of calcification within a renal mass should increase the index of suspicion for malignancy.