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Radiology, Vol 193, 247-250, Copyright © 1994 by Radiological Society of North America

ARTICLES

Adrenal adenomas: characteristic hyperintense rim sign on fat-saturated spin-echo MR images

T Ichikawa, K Ohtomo, G Uchiyama, K Koizumi, S Monzawa, H Oba, Y Nogata, K Kachi, K Toyama and M Yamaguchi
Department of Radiology, Yamanashi Medical College, Japan.

PURPOSE: To determine whether adrenal adenomas can be differentiated from metastases on fat-saturated magnetic resonance (MR) images. MATERIALS AND METHODS: Twenty-eight adrenal adenomas and 20 metastatic lesions were imaged at 1.5 T by means of fat-saturated T1- and T2- weighted and gadolinium-enhanced T1-weighted sequences. The authors evaluated visually whether structures of high signal intensity (hyperintense rim sign) could be observed in the outer margin of the adrenal masses. RESULTS: Twenty-six of 28 adrenal adenomas revealed the hyperintense rim sign on at least one kind of fat-saturated image, compared with only one of 20 metastases. The sensitivity of the hyperintense rim sign as suggestive of adrenal adenoma was 92%, specificity was 95%, and overall accuracy was 94%. CONCLUSION: The hyperintense rim sign is characteristic of adrenal adenomas. Thus, adrenal adenomas can be differentiated from metastases by means of this new imaging sign on fat-saturated MR images.


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