AAST Bowel and Mesenteric Injury Scale
AAST small bowel / colon OIS (Moore 1990) — combined bowel–mesentery presentationSelects AAST grade I–V for bowel wall and mesenteric trauma, from hematoma or partial-thickness injury without devascularization through full-thickness laceration, transection, and segmental devascularization.
Also searched as: trauma · mesentery · hollow viscus · small bowel · intestine
Information
Incomplete input
- Please provide: AAST bowel / mesenteric injury grade.
How this tool works
Hollow-viscus and mesenteric injuries are among the most frequently missed life-threatening findings on trauma CT. The classic AAST small-bowel (and analogous colon) scales grade contusion/hematoma without devascularization and partial-thickness tears as grade I, full-thickness lacerations by circumference as grades II–III, transection as grade IV, and transection with tissue loss or a devascularized segment as grade V. Mesenteric injuries that threaten bowel viability (bucket-handle tears, active bleeding with ischemia) behave as high-grade lesions. Any full-thickness bowel perforation is a surgical lesion; isolated small mesenteric hematomas without compromise may be observed in selected stable patients with serial exams.
References
- Moore EE, et al. J Trauma 1990;30:1427-1429 (small bowel / colon OIS)
- Radiopaedia — Bowel and mesenteric trauma injury grading
- AAST Injury Scoring Scale index
Implemented from the cited published sources. Educational use only; confirm against current guidelines before clinical use.
Related calculators
Same subspecialty, overlapping subject matter.