Intraperitoneal abscess after an undetected spilled stone.

Gallbladder perforation with loss of calculi in the abdomen is frequent during laparoscopic cholecystectomy and can cause serious late complications. We report on a 65-year-old woman who underwent laparoscopic cholecystectomy for gallbladder empyema, during which a stone spilled into the peritoneal cavity. The spilled gallstone was not noticed during the initial operation. Three months later, she reported left upper quadrant pain of recent onset without associated symptoms such as fever, nausea, or weight loss. On examination, a palpable 2-cm tender subcutaneous mass was found. Abdominal ultrasound demonstrated an incarcerated hernia, and computed tomography (CT) scan showed an intraperitoneal abscess located in the back of the anterior abdominal wall in the left upper quadrant, which contained a recalcification figure. The patient was brought to surgery, at which time an incision was made over the mass. A chronic abscess in the back of the abdominal wall, also spreading into the subfascial space, was drained, and purulent material was obtained with a large stone, 2.8 cm in diameter, which had become lodged in the rectus abdominis after an undetected stone spillage during laparoscopic cholecystectomy. The patient continued receiving antibiotic treatment for 7 days, recovered well, and was discharged 7 days after drainage of the abscess.