A 42-year-old woman underwent laparoscopic appendectomy. She was found to have a gangrenous appendix. She was treated with a 7d course of antibiotics postoperatively. At the end of the 7 days, she was afebrile with a normal white count and was discharged to home. Three days later she represented with fever and leukocytosis. A pelvic mass was felt on rectovaginal examination and a well-developed pelvic abscess (see appendicitis discussion) was seen on CT scan. The inflammatory rind is well defined (highlight). The abscess was drained transvaginally with ultrasound guidance and a pigtail catheter was left in place for four days, at which time the drainage was minimal. Repeat CT scan at that time showed the cavity to be collapsed. The patient was afebrile with a normal WBC count when discharged. The patient was asymptomatic on follow-up.