Ureter injuries are graded I-V with increasing severity having higher grading.

• Grade I: Ureteral hematoma or contusion without devascularization
• Grade II: Ureteral laceration (<50% transection)
• Grade III: Ureteral laceration (>50% transection)
• Grade IV: Ureteral laceration with complete transection with <=2 cm devascularization
• Grade V: Ureteral laceration with complete transection with >2 cm devascularization

The grading is increased by 1 grade for multiple injuries or bilateral injuries up to grade III.

References:

• Moore EE, Cogbill TH, Jurkovich GJ, et al. Organ injury scaling. III: Chest wall, abdominal vascular, ureter, bladder, and urethra. J Trauma. 1992;33(3):337-9.
• Trauma.org. Organ Injury Scaling: Ureter. http://www.trauma.org/archive/scores/ois-ureter.html. Last accessed June 13, 2013.