Traumatic abdominal wall herniation.

Most reported cases of traumatic abdominal wall herniation result from seatbelt or handlebar injuries. The diagnosis is often made on physical examination or abdominal computed tomography (CT). We report a 59-year-old man with traumatic herniation through the rectus muscle following low-velocity blunt abdominal trauma. This patient was initially thought to have a rectus sheath haematoma and initial CT showed a soft tissue haematoma over the left lower anterior abdominal wall but no herniation. The traumatic herniation was diagnosed four days later, and confirmed on CT. Intraoperatively, a segment of the sigmoid colon was found to have herniated through the rectus defect and was gangrenous with impending perforation. A left hemicolectomy followed by primary repair of the defect was done. This case highlights the need for a high index of suspicion for traumatic herniation in patients who sustain low-velocity blunt abdominal wall trauma even when initial CT scans are negative.