Reverse rim sign (kidney)
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The reverse rim sign describes relative hypoenhancement of the renal cortex and normal enhancement of the renal medulla on contrast-enhanced CT and MRI. This enhancement pattern can also be visualized using contrast-enhanced ultrasound 2.
It is a typical finding of renal cortical necrosis that may occur in the setting of renal transplant rejection, intravascular hemolysis, shock, and as an obstetric complication 3.