This document discusses fatty lesions of the liver that can be identified on medical imaging. It includes 8 figures showing examples such as focal hepatic steatosis identified on MRI as peripheral high intensity foci that decrease uniformly on opposed-phase imaging. Other examples shown are omental packing appearing as a hepatic pseudomass on CT, hepatic adenomas appearing as fat-attenuating lesions on CT and decreasing signal intensity on opposed-phase MRI, and angiomyolipoma appearing as a heterogeneous tumor containing foci of fat on CT.

1. 76Fatty Lesions of the Liver

2. CLINICAL IMAGAGING
AN ATLAS OF DIFFERENTIAL DAIGNOSIS
EISENBERG
DR. Muhammad Bin Zulfiqar
PGR-FCPS III SIMS/SHL

3. • Fig GI 76-1 Focal hepatic steatosis. (A) In-
phase T1-weighted MR image shows
peripheral high-intensity foci (arrow). (B) On
the opposed-phase image, there is a uniform
decrease in the signal intensity of the foci
(arrow).137

4. • Fig GI 76-2 Omental packing. Contrast CT scan
shows a hepatic pseudomass (arrow), a
common postoperative finding.137

5. • Fig GI 76-3 Hepatic adenoma. Unenhanced CT
scan shows multiple fat-attenuation lesions
within the liver.137

6. • Fig GI 76-4 Hepatic adenoma. (A) In-phase T1-
weighted MR image shows a large
hypointense mass in the right lobe of the liver
(arrow). On the out-of-phase image, there is a
homogeneous decrease in the signal intensity
of the fat-containing lesion.137

7. • Fig GI 76-5 Angiomyolipoma. Contrast CT scan
demonstrates a well-circumscribed,
heterogeneous tumor of the right lobe of the
liver that contains foci of fat (arrow).137

8. • Fig GI 76-6 Hepatic invasion by a
retroperitoneal teratoma. Contrast CT scan
shows a predominantly fatty mass with a
peripheral rim and central chunky calcification
(arrow).137

9. • Fig GI 76-7 Adrenal rest tumor. CT scan shows
a heterogeneous lesion in the right lobe that
contains macroscopic fat (arrow).137

10. • Fig GI 76-8 Hepatocellular carcinoma. Contrast
CT scan shows patchy macroscopic fat
deposition (□) in a large, heterogeneously
enhancing hepatoma.137