Renal colic due to Henoch-Schönlein purpura.

A six-year-old boy with Henoch-Schönlein purpura (HSP) presented with renal colic and the passage of tubular-shaped blood clots in the urine. The authors suggest that the renal colic was due to a ureteritis. Ureteritis in patients with HSP may be more common than is generally appreciated.