AAST bladder injury scale

Grade*	Injury type	Description of injury
I	Hematoma	Contusion, intramural hematoma
I	Laceration	Partial thickness
II	Laceration	Extraperitoneal bladder wall laceration <2 cm
III	Laceration	Extraperitoneal (≥2 cm) or intraperitoneal (<2 cm) bladder wall laceration
IV	Laceration	Intraperitoneal bladder wall laceration ≥2 cm
V	Laceration	Intraperitoneal or extraperitoneal bladder wall laceration extending into the bladder neck or ureteral orifice (trigone)

AAST: American Association for the Surgery of Trauma.
* Advance one grade for multiple lesions up to grade III.

Reproduced with permission from: Moore EE, Cogbill TH, Jurkovich GJ, et al. Organ injury scaling. III: Chest wall, abdominal vascular, ureter, bladder, and urethra. J Trauma 1992; 33:337. Copyright © 1992 Lippincott Williams & Wilkins. Available at: https://www.aast.org/resources-detail/injury-scoring-scale#bladder (Accessed on December 10, 2019).

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AAST bladder injury scale