Fig. 1

Patient 1. A 26 year old who had been training for 36 months. He presented with renal insufficiency and a creatinine of 2.6 mg/dl. The biopsy shows dilated tubules lined by flattened mitotically active epithelium. An intraluminal calcification surrounded by regenerative cells is present. Hematoxylin and eosin stain × 400