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Fat Sparing of Surrounding Liver From Metastasis in Patients with Fatty Liver: MR Imaging with Histopathologic Correlation

¹ All authors: Department of Diagnostic Radiology and Research Institute of Radiological Science, Yonsei University College of Medicine, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-752, Korea.

View larger version (119K): [in a new window]   Fig. 1A .—75-year-old woman with liver metastasis from colon cancer. On unenhanced in-phase spoiled gradient-echo MR image, 3.1 x 2.2 cm mass is noted in segment VII of liver without peritumoral signal-intensity change. Liver shows diffusely increased signal intensity on in-phase spoiled gradient-echo MR image because of fatty infiltration.

View larger version (116K): [in a new window]   Fig. 1B .—75-year-old woman with liver metastasis from colon cancer. On unenhanced out-of-phase axial spoiled gradient-echo MR image, 5.5 x 3.8 cm wedge-shaped high-signal-intensity lesion (large arrowheads) surrounding low-signal-intensity tumor (small arrowheads) is seen in segment VII of liver that is well contrasted by diffusely decreased signal intensity of remaining fatty liver parenchyma.

View larger version (154K): [in a new window]   Fig. 1C .—75-year-old woman with liver metastasis from colon cancer. On histopathologic photomicrograph, fat-sparing zone (solid line) is well depicted between tumor mass (T) and fatty liver parenchyma (F). (H and E, x20)

View larger version (120K): [in a new window]   Fig. 2A. —37-year-old woman with liver metastasis from ileal carcinoid. On unenhanced in-phase spoiled gradient-echo MR image, 2.5 x 1.8 cm well-defined mass is noted in segment VIII of liver dome without peritumoral signal-intensity change. Liver shows diffusely increased signal intensity on in-phase spoiled gradient-echo MR image because of fatty infiltration.

View larger version (115K): [in a new window]   Fig. 2B. —37-year-old woman with liver metastasis from ileal carcinoid. On unenhanced out-of-phase axial spoiled gradient-echo MR image, 4.5 x 3.5 cm polygonal high-signal-intensity lesion (large arrowheads) surrounding low-signal-intensity tumor (small arrowheads) is seen in segment VIII of liver, which is contrasted with diffusely decreased signal intensity of remaining fatty liver parenchyma.

View larger version (120K): [in a new window]   Fig. 2C. —37-year-old woman with liver metastasis from ileal carcinoid. On early contrast-enhanced spoiled gradient-echo MR image without fat suppression, metastatic tumor is well enhanced because of primary hypervascular ileal carcinoid tumor. Polygonal fat sparing is not differentiated from surrounding fatty liver parenchyma.

View larger version (142K): [in a new window]   Fig. 2D. —37-year-old woman with liver metastasis from ileal carcinoid. On histopathologic photomicrograph, fat-sparing zone (solid line) is well visualized between tumor mass (T) and fatty liver parenchyma (F). (H and E, x20)

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