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Radiology, Vol 192, 41-46, Copyright © 1994 by Radiological Society of North America
ARTICLES |
JW Reinig, JE Stutley, CM Leonhardt, KM Spicer, M Margolis and CB Caldwell
Anne Arundel MRI, Annapolis, MD 21403.
PURPOSE: To determine the efficacy of various magnetic resonance (MR) imaging sequences for the differentiation of adrenal masses. MATERIALS AND METHODS: Fifty-three adrenal masses in 46 patients (adenomas, metastases, myelolipomas, hemorrhages, and pheochromocytomas) were evaluated by means of T1-, T2-, and T2*-weighted sequences, calculated T2 values, chemical shift imaging techniques, and dynamic contrast material-enhanced imaging. The Student t test and receiver operating characteristic analysis were used to evaluate the differences in the groups of masses. RESULTS: Analysis of the chemical shift-induced signal intensity of the adrenal masses and the T2*-weighted sequence enabled differentiation of adenomas, metastases, and pheochromocytomas. Adenomas and pheochromocytomas were also differentiated by means of a heavily T2-weighted sequence. Signal intensity values for all masses overlapped. CONCLUSION: Although a chemical shift imaging technique and a T2*-weighted sequence helped correctly differentiate among the groups of adrenal masses, the degree of overlap suggests that it is still difficult to evaluate disease in individual patients.
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