MR findings of renal cortical necrosis

Purpose: Evaluating the MR findings of renal cortical necrosis was the purpose of this study. Method: Eight series of T1-/T2-weighted (n = 8) and contrast-enhanced T1-weighted (n = 4) MR images in six patients with renal cortical necrosis diagnosed by renal biopsy (n = 4) or on clinical grounds (n = 2) were reviewed. In those who had follow-up MRI (n = 2) or comparable CT (n = 3), interval changes of MR findings and comparison with CT images were done. Results: Swollen kidney with dark signal intensity rim involving the inner cortex and column of Bertin was noted on T2- and T1-weighted images. It was more conspicuous on T2-weighted images. The lesion did not enhance and was differentiated from uninvolved renal parenchyma. In the follow-up MRI, thickened dark signal intensity was more prominent and proved to be calcification or fibrosis. Conclusion: MRI. especially T2-weighted and contrast-enhanced T1-weighted imaging. was helpful in evaluating renal cortical necrosis.