Liver tumors in fatty liver: difficulty in ultrasonographic interpretation.

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.