Diagnosing small bowel and mesenteric injuries (SBMI) following abdominal trauma presents a major medical challenge, particularly when initial imaging appears non-definitive and multiple distracting injuries mask symptoms, according to a recent case report published in line with SCARE 2025 criteria. A 39-year-old male construction worker sustained combined blunt and penetrating trauma to his right lumbar region when a heavy object fell from a height of 2 to 2.5 meters. Although he was hemodynamically stable upon presentation with a negative focused assessment with sonography for trauma (FAST) examination, delayed recognition of occult bowel perforations ultimately led to diffuse four-quadrant peritonitis requiring emergency surgery.
Initial Presentation and Non-Definitive Computed Tomography Findings
Upon arrival at the emergency department, the patient reported severe generalized abdominal and right lumbar pain rated 10 out of 10, according to the trauma team records. Initial vital signs showed a blood pressure of 165/92 mmHg, a heart rate of 94 beats per minute, a respiratory rate of 14 breaths per minute, a temperature of 36.9°C, and an oxygen saturation of 99% on room air. Laboratory tests revealed leukocytosis with a white blood cell count of 18.2 x 10⁹/L and neutrophilic predominance. Computed tomography (CT) imaging demonstrated a right psoas intramuscular hematoma containing small air locules with surrounding soft tissue stranding, alongside multiple associated skeletal injuries including a comminuted fracture of the right humerus, a scapular spine fracture, left rib fractures, a left hemopneumothorax, and displaced L3-L4 transverse process fractures. Crucially, the initial CT scan revealed no pneumoperitoneum, mesenteric hematoma, or definitive radiological evidence of hollow viscus injury.
Pro Tip: According to clinical literature, computed tomography achieves a reported sensitivity of 75 to 95 percent for small bowel and mesenteric injuries, meaning up to 30 percent of these traumatic injuries can be initially missed when findings are subtle or obscured by adjacent hematomas.
Clinical Course and Sudden Deterioration on Post-Injury Day Three
Following initial wound debridement, irrigation, and left chest tube insertion, the patient was admitted for conservative observation due to his hemodynamic stability and negative initial imaging. On post-injury Day 1, he reported persistent right lower abdominal pain with generalized guarding. By Day 2, however, his clinical exam improved; his abdomen became soft and non-tender, and he successfully passed stool. This apparent recovery proved temporary. On Day 3, the patient developed acute worsening abdominal pain, abdominal distension, rigidity, new right abdominal wall bruising, and palpable subcutaneous crepitus, according to the hospital records. A repeat CT scan on Day 3 revealed a large loculated right upper quadrant pneumoperitoneum, extensive right abdominal wall emphysema, and secondary thickening of the terminal ileum indicative of peritonitis.
Emergency Surgical Intervention and Favorable Postoperative Recovery
Faced with acute clinical deterioration and positive radiological signs of peritonitis, surgical teams performed diagnostic laparoscopy that was quickly converted to an open laparotomy upon the identification of free intestinal contents. Intraoperative exploration revealed diffuse four-quadrant peritonitis driven by multiple opposing full-thickness perforations in the distal ileum and associated mesenteric lacerations. Surgeons performed a segmental resection of the involved distal ileal loops followed by a mechanical side-to-side anastomosis using a GIA 55 stapler approximately 80 centimeters proximal to the ileocecal valve, alongside an extensive warm saline washout and perianastomotic drain placement. The patient recovered well without major complications, resumed oral intake on Day 3, had drains removed on Day 5, and was discharged on postoperative day nine, according to clinical follow-up data.
Frequently Asked Questions
Why are small bowel and mesenteric injuries often missed on initial CT scans?
Initial CT scans may fail to detect small bowel and mesenteric injuries because findings such as subtle bowel wall thickening, localized fluid, or minimal extraluminal gas are frequently non-specific and can be easily obscured by adjacent hematomas or severe musculoskeletal trauma.
What are the primary clinical indicators that suggest delayed bowel perforation?
Delayed recognition is typically signaled by the sudden or progressive return of severe abdominal pain, localized guarding, abdominal rigidity, abdominal distension, wall bruising, and subcutaneous crepitus, which warrant immediate repeat imaging.
Can temporary clinical improvement rule out a traumatic bowel injury?
No. Medical literature emphasizes that transient symptomatic improvement does not reliably exclude an occult bowel injury, as ischemia, hematoma expansion, or wall necrosis can evolve over several days following the initial impact.
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