The most common source of traumatic retroperitoneal hemorrhage is a pelvic fracture (399). Associated urinary bladder tears and lacerations of major pelvic vessels are
encountered (399). Perinephric hemorrhage necessitates an in situ inspection of the renal arteries and veins to exclude laceration (Fig. 44). Renal cortical tears also bleed (Fig. 44). Isolated psoas muscle hemorrhage has been described (400). Retroperitoneal hemorrhage, without a recognizable origin, does occur (399).
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