KIDNEY - Pyonephrosis and Calculus

This kidney shows gross dilatation of the calyceal system, with evidence of pus in some of the dilated calyces. There is a very large staghorn calculus present.
This woman suffered left-sided backache for the previous 10 years, with 2 to 3 episodes a month. After a fall in 1976, a back X-ray showed a calculus in the left kidney. At about that time, she had attacks of urinary infection. She had a normal calcium and oxylate intake, and her metabolic screen was normal. Analysis of the stone showed that this was a triple phosphate stone.