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Differential diagnosis of space-occupying lesions of the liver with MR imaging.

In a retrospective study of 84 patients who underwent MRI examination of the liver the qualitative parameters margin, shape, internal structure, signal intensity and the presence of a capsule were evaluated in 152 lesions comprising 48 hemangiomas, 54 secondary deposits, 23 hepatomas, 8 simple cysts, 17 hydatid cysts, 1 abscess and 1 focal fatty infiltration. Our main objective was to differentiate hemangiomas from secondary deposits and hepatomas. In hemangiomas the combination of smooth margin (98%) round or oval shape (90%) homogeneity (96%) very high signal intensity on T2-weighted sequence (94%), and the complete absence of capsule helped to distinguish them from secondary deposits and hepatomas in the majority of cases. It is concluded that with MR imaging we can establish the diagnosis of focal lesions of the liver in about 95% of cases.