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©2013 UpToDate ® Print Email AAST Organ Injury Scales for stomach, small intestine, colon, and rectum Injured structure AAST grade* Characteristics of injury AIS-90 score Stomach I Intramural hematoma <3 cm; partial-thickness laceration 2 II Intramural hematoma ≥3 cm; small (<3 cm) laceration 2 III Large (>3 cm) laceration 3 IV Large laceration involving vessels on greater or lesser curvature 3 V Extensive (>50 percent) rupture; stomach devascularized 4 Small bowel I Contusion or hematoma without devascularization; partial-thickness laceration 2 II Small (<50 percent of circumference) laceration 3 III Large (≥50 percent of circumference) laceration without transection 3 IV Transection 4 V Transection with segmental tissue loss; devascularized segment 4 Colon I Contusion or hematoma; partial-thickness laceration 2 II Small (<50 percent of circumference) laceration 3 III Large (≥50 percent of circumference) laceration 3 IV Transection 4 V Transection with tissue loss; devascularized segment 4 Rectosigmoid and rectum I Contusion or hematoma; partial-thickness laceration 2 II Small (<50 percent of circumference) laceration 3 III Large (≥50 percent of circumference) laceration 4 IV Full-thickness laceration with perineal extension 5 V Devascularized segment 5 AIS-90: Abbreviated Injury Score, 1990 version; AAST: American Association for the Surgery of Trauma. * Advance one grade for multiple injuries, up to grade III. Reproduced with permission from: Weinberg JA, Fabian TC. Injuries to the stomach, small bowel, colon, and rectum. In: ACS Surgery Principles and Practice, 6th Edition, Ashley SA (Ed), BC Decker, 2007. Copyright © 2007 BC Decker.