Abstract

Cystinuria is an inborn error in transportation of the dibasic aminoacids (cystine, ornithine, arginine and Iysine) that results in excessive urinary excretion of these products. The only known complication of this familial disease is the fonnation of urinary calculi owing to the low solublity of cystine. The sulphur content of cystine gives these stones their radioopaque appearence. In this case report, we present a 6 year old boy with bilateral renal calculi detected in plain roentgenogram of abdomen. The further investigations on this patient reached the diagnosis of cystinuria.