Pelvic fractures (Malgaigne fracture)

Discussion:

This case demonstrates a combination of right pubic rami and sacral ala fractures consistent with a vertical shear mechanism of injury (Malgaigne fracture). Nicely seen on the plain film is subtle loss of the normal sacral foraminal margin indicating sacral ala fracture. On the CT, there is a good example of small volume pre-sacral hemorrhage.     

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