Abstract
A 5 year-old boy was admitted into our hospital for a urinary tract infection (UTI) after 4 years interval of the first reference. An ultrasonogram (USG) and an intravenous pyelography (IVP) revealed a caliceal diverticulm of the left kidney. He had two episodes of UTI. An USG and an IVP had been performed recurrently, but caliceal diverticulm had not been found previously. The etiology of a caliceal diverticulm is usually discribed as congenital : i. e., an embryological maldevelopment of the pelvio-calyceal system. But this theory is only a suggestion and has not been proven. In our case, a caliceal diverticulm that had not been found in infancy was detected at 5-year old. His caliceal diverticulm was considered to be acquired. His clinical course has been carefully followed and there has been no change in size or in morphology during the past 6 months. In literture, there have been no reported cases of acquired calceal diverticulm, and few reports about careful follow up. Our case is considered to be interesting for the investigation of the etiology of caliceal diverticulm.
