Purpose: To determine the frequency and sonographic features of focal sparing of fatty liver at segment 2.
Materials And Methods: The sonographic database was searched over the preceding three years. The criteria for sonographic diagnosis of focal sparing of fatty liver was an area of liver parenchyma of relatively low echogenicity with lack of mass effect.
Results: Six (0.9%) of 686 patients with diffuse fatty liver showed focal sparing at segment 2. The areas showed spherical or ovoid hypoechoic mass-like lesions measuring 2 to 6 cm in longest diameter (average, 3.8 cm). These all abutted on the posterior surface of segment 2 adjacent to the ligamentum venosum. These were segmental in two cases and subsegmental in four.
Conclusion: In diffuse fatty liver, segment 2 is infrequently spared, and this may be a helpful adjunct sign of fatty liver.
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