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Computed tomography in evaluation of blunt renal trauma. Potential for misdiagnosis of renal infarction.

A case of global renal infarction resulting from blunt renal trauma is presented. The cortical 'rim sign' on computed tomographic (CT) scanning is suggestive of major renal arterial occlusion. Clinicians who use CT scanning as the initial imaging modality for the evaluation of blunt kidney trauma should be aware of this sign and its implications for management.