Abstract
We experienced a case with a localized abdominal abscess that was thought to be caused by an infectedurachal cyst; an emergency operation was performed because of localized peritonitis. A 38-year-oldfemale was admitted to hospital with severe abdominal pain and diarrhea. A mass was palpated in thecenter of her lower abdomen, and an abdominal computed tomography showed a cystic mass about 5cm indiameter lying beneath the peritoneum along the midline of the lower abdomen and in contact with thebladder. Coagulase-negative Staphylococcus (CNS) was detected in cultures of her watery stools. Inaddition, the patient had untreated diabetes mellitus. A laparotomy showed the formation of an abscess infront of the bladder and omentum penetration. The abscess cavity was surgically removed, and a drainagetube was inserted. CNS was detected in the abscess. The CT and operative findings suggested that theinfected urachal cyst had caused the abscess. A urachal cyst is a persistent structure of a fetus and isgenerally diagnosed by infection complications and the enlargement of the cyst. The formation of an intra-peritoneal abscess is rare. We suspect that the cause of the urachal cyst infection was a bacterialtranslocation from the intestine to the blood circulation because the patient was in an easily infectiouscondition as a result of her uncontrolled diabetes mellitus.
