“…In over 50% of cases, the etiology is dominated by benign or malignant tumors of the kidney (2,3,4,5,7,8,9). It may be secondary to bleeding from a renal angiomyolipoma (8,10) or a renal carcinoma, or more rarely to a spontaneous rupture of a renal artery, an arteriovenous malformation, a simple cyst of the kidney, or be a manifestation of polyarteritis nodosa (6). Symptoms of renal bleeding can be frustrating, such as moderate pain or macroscopic hematuria.…”