The Organ Injury Scale (OIS) for splenic trauma assigns grade III to which of the following CT findings?
- A Laceration >3 cm parenchymal depth or involving trabecular vessels ✓
- B Subcapsular haematoma <10% surface area
- C Laceration involving segmental or hilar vessels with major devascularization (>25%)
- D Completely shattered spleen
Correct answer: A. Laceration >3 cm parenchymal depth or involving trabecular vessels
Explanation
The AAST OIS grade III splenic injury is defined as a laceration greater than 3 cm parenchymal depth or a laceration involving trabecular vessels. Grade I is minor haematoma or superficial laceration (<1 cm depth). Grade IV involves segmental or hilar vessel injury with >25% devascularization. Grade V is a shattered spleen or hilar vascular injury. Accurate grading guides non-operative vs. interventional vs. surgical management.
Reference: Grainger & Allison's Diagnostic Radiology, 7th ed.
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