KIDNEY - Arteriovenous Malformation

The specimen is a hemisected left kidney of normal size. The renal cortex and medulla are normal. There is a mass of small vascular channels immediately overlying the renal pelvis. These are situated adjacent to the medullary renal fat. This patient had three episodes of haematuria over a 12 month period. Renal arteriography revealed the presence of a left upper pole arteriovenous malformation. This was treated by simple nephrectomy.