Abstract
This paper reports 3 cases of the infected urachal cyst communicated with the bladder. The first case was a 5 year-7 month-old girl with a lower abdominal mass and pyuria. The cystogram showed conical projection upward the umbilicus that suggested a communication to the cyst. The second case was an 8 month-old girl with an umbilical fistula. Microscopic examination revealed a small channel to the bladder. The interior of this cyst was lined by transitional cells. The third case was a 2 year-8 month-old boy with complaints of an abdominal mass and pollakiuria. Infection of the cyst made the bladder mucosa hyperemic and caused symptoms of urocystitis without presence of bacteria. Ultrasonography was usefull to demonstrate the size of the cyst and to determine the site of skin incision. The infected urachal cyst should be excised completely including the duct which communicates with the bladder.
