Primary abscess of the omentum: report of a case.

We report a case of a primary abscess of the omentum without any obvious etiology. A 62-year-old man was referred to our clinic with lower abdominal pain, and computed tomography showed an intra-abdominal abscess in the left pelvic area. Laparotomy revealed that the abscess adhered to the urinary bladder and abdominal wall, but no perforation of the alimentary tract was identified and there was no foreign body in the abscess cavity. A culture of the abscess fluid grew Clostridium perfringens. The patient was discharged on the 16th hospital day after an uneventful postoperative course without any complications.