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.