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Table 3 Traditionally used American Association for the Surgery of Trauma (AAST) scoring system for splenic injuries

From: Splenic artery embolization: technically feasible but not necessarily advantageous

Grade Hematoma Laceration
I Subcapsular < 10 % of surface area Capsular tear < 1 cm deep into parenchyma
II Subcapsular 10–50 % of surface area Capsular tear 1–3 cm deep into parenchyma NO involvement of trabecular vessels
III Subcapsular > 50 % of surface area
OR
Expanding, ruptured subcapsular or parenchymal hematoma
OR
Intraparenchymal hematoma > 5 cm or expanding
>3 cm deep into parenchyma or trabecular vessel involvement
IV   Segmental or hilar vessel involvement with major devascularization (>25 %) of spleen
V Shattered spleen Hilar vascular injury that devascularizes spleen