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Hemangioma Essay

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A.2. Atypical features A.2.1. Heterogeneous large and giant hepatic hemangiomas At US, large hemangiomas seem heterogeneous. With using non-contrast CT, the lesion may be seen hypoattenuating and heterogeneous with low attenuated central areas. After administration of contrast material, the filling is incomplete during the portal venous and delayed phases. On T1-weighted images, the lesion is observed as a marginated hypointense mass containing hypointense septa and a hypointense cleft. On T2-weighted images, the internal septa remain hypointense, but the cleft is hyperintense. The enhancement is similar to that of CT imaging and the internal septa and cleft remain hypointense (14, 15). A giant hemangioma is a large (over 4 cm in diameter) cavernous…show more content…
The FNH lesions are often multiple in these patients (17, 18). In fact, multiple hemangiomas provide adequate arterial flows for the development of multiple FNH lesions (a hyperplastic response) (2). A.2.7. Hemangioma with capsular retraction This finding usually reflects the presence of a marked focal fibrous stromal reaction in the sclerosed hemangiomas and should not be considered a definite marker of malignancy (5, 19). A.2.8. Hemangiomas and the dilation of the bile duct This condition is seen when a hemangioma is located in segment IV or close to the hepatic hilium (20). A.2.9. Hemangioma and hepatic steatosis In the severe fatty liver, the typical appearance of hemangiomas is altered. The lesion may appear hyperechogenic, isoechogenic or hypoechogenic compared to the steatotic liver with or without a posterior acoustic enhancement at US examination. In non-contrast CT the lesion may be found hyperdense or isodense (2, 21). When a contrast material is used or when T2-weighted images are acquired the presence of hepatic steatosis does not affect the appearance of hemangiomas. A perilesional zone may be seen without fat infiltration (22,
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