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Table 1 AAST splenic laceration grading by CT. Other findings on CT not included in AAST criteria but important for triaging patients include active extravasation and pseudoaneurysm

From: Review of proximal splenic artery embolization in blunt abdominal trauma

  Grade I Grade II Grade III Grade IV Grade V
Subcapsular hematoma extent < 10% of surface area 10–50% of splenic surface area > 50% of splenic surface area, ruptured subcapsular hematoma, N/A N/A
Laceration depth < 1 cm 1-5 cm >5 cm N/A N/A
Other     Laceration of vessels leading to > 25% devascularization Shattered spleen, complete devascularization