The abdomen is a diagnostic challenge because significant blood loss can occur without dramatic external changes or obvious signs of peritoneal irritation.

Anatomy and Mechanism The anatomical focus extends from the nipple line to the perineum, encompassing three distinct zones: the peritoneal cavity, the retroperitoneal space (which is difficult to assess via physical exam or FAST), and the pelvic cavity.

• Blunt Trauma: Resulting from compression, shearing, or deceleration (e.g., motor vehicle crashes, falls), these forces deform organs. The spleen and liver are most frequently injured, though seat belts can cause specific bowel injuries.

• Penetrating Trauma: Gunshot wounds (GSWs) and stabs require trajectory analysis. Transabdominal GSWs have a 98% incidence of significant i ...