Proceed Directly to Surgical Exploration
A patient with visible omentum protruding through a stab wound has confirmed peritoneal violation and requires immediate laparotomy or diagnostic/therapeutic laparoscopy, regardless of CT findings 1.
Why the Negative CT Doesn't Change Management
The presence of omentum protruding through the wound is physical proof of peritoneal breach—this is a clinical finding that supersedes imaging. The 2022 WSES guidelines explicitly state that when peritoneal violation is confirmed (which omental protrusion definitively demonstrates), you should proceed with either:
- Diagnostic/therapeutic laparoscopy, or
- Laparotomy
The guidelines emphasize that "conversion to laparotomy is always possible and highly recommended if any doubts or difficulties arise" 1.
Critical Pitfall: Don't Be Falsely Reassured by Negative CT
A negative CT should not be used as the sole determinant for discharging a patient unless a tangential and extraperitoneal wound tract is confirmed 1. In your case, you already have visible omental protrusion—the wound tract is clearly NOT extraperitoneal.
CT has only 88% sensitivity for detecting bowel injury in stab wounds 1, meaning 12% of significant injuries are missed. The guidelines specifically warn that CT scans "should be less relied upon" for anterior stab wounds where clinical assessment is more reliable 1.
The Algorithm for This Patient
- Hemodynamic status assessment: If unstable → immediate laparotomy
- If hemodynamically stable with omental protrusion → proceed to operating room for:
- Diagnostic laparoscopy (preferred if surgeon experienced and resources available) 1
- OR direct laparotomy
- During exploration: Systematically inspect entire bowel for injury, as CT has missed potential injuries
- Low threshold for conversion from laparoscopy to laparotomy if visualization is inadequate 1
Why Nonoperative Management Is NOT an Option Here
While NOM can be performed for select penetrating trauma patients, it requires that peritoneal violation be ruled out or uncertain 1. The guidelines state: "When positive [for peritoneal breaching], serial clinical examinations should follow, where there is clinical suspicion for bowel injury a diagnostic/therapeutic laparoscopy or laparotomy is warranted" 1.
Omental protrusion = confirmed peritoneal violation = surgical indication. This patient has moved beyond the NOM selection criteria.
The risk of missed bowel injury with delayed diagnosis is linked to increased morbidity and mortality 1. With omentum already extruded, the injury severity warrants exploration to prevent complications from undiagnosed bowel perforation or mesenteric injury.