Black where it should not be. A 60-year-old male patient who underwent laparotomy gastrectomy with fever and abdominal pain. At ultrasound, a pluriloculated fluid collection was detected in the abdominal wall with a fistulous connection in the peritoneal cavity. No free fluid in the abdomen was detected. A suspected diagnosis of infected collection along the laparotomy suture was formulated. Final diagnosis: abscess along the laparotomy suture with peritoneal fistulous connection.