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Figure 7d. Transverse MR images in a 53-year-old man with upper abdominal pain. (a) T1-weighted gradient-recalled-echo image (225/4.2, 90° flip angle) demonstrates a 6-cm mass in the spleen, with low signal intensity in the periphery (arrows) of the lesion and high signal intensity in the center. There are multiple lesions in the liver with similar characteristics to that in the spleen. (b) T2-weighted fast spin-echo image (2729/183) shows high signal intensity in the periphery and most of the center of the lesions (compared with signal intensity of the normal spleen). There is some inhomogeneity in the center of the lesion. Similar findings are seen in the multiple liver lesions. (c) Precontrast and (d) postcontrast gradient-recalled-echo images (220/1.3, 90° flip angle) obtained at a slightly different level than a and b. The contrast enhancement is in the portal venous phase, and marked enhancement of the periphery of the splenic lesion and the two hepatic lesions is seen. The low signal intensity in the center of the lesions is caused by necrosis (proved at pathologic examination).
