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Liver tumors in fatty liver: difficulty in ultrasonographic interpretation
1First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita 010, Japan.
Background:
Fatty liver and liver tumors are very frequent diseases. Sonography (US) currently is the initial diagnostic tool for hepatic exploration. However, there is a marked paucity of US findings of tumors in fatty liver.
Methods:
We studied the US findings of 41 lesions (31 patients) with this combination, with special attention paid to internal echoes, marginal echoes, and especially the mode of back echoes, and compared them with the US results of 64 lesions (38 patients) without fatty liver.
Results:
Comparing the group having liver tumor without fatty liver with the group having liver tumor with fatty liver showed that (a) the number of hypoechoic lesions increased (29 of 41, 70.7%, vs. 16 of 64, 25.0.%), (2) the tumor margin appeared indistinct (32 of 41, 78.0%, vs. nine of 64, 14.1%), and (c) the lesions showing posterior echo enhancement increased (34 of 41, 82.9%, vs. eight of 64, 12.5%).
Conclusion:
Liver tumors in fatty liver are expected to show unusual patterns on US, so we should consider this difficulty when interpreting these US findings and we should not make a conclusion without including other imaging modalities.