PMC2627818_01
Portal-stage contrast-enhanced helical CT of the upper abdomen. Impregnation by the contrast agent shows a large, solid, exofitic lesion compromising the left liver lobe. The enhancement is intense and heterogeneous, the dominant portion being in the periphery of the lesion (arrow).
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F1
Computed tomography (CT) of the upper abdomen (Figure 1) showed a heterogeneous lesion - measuring 15 x 14 x 10 cm - with a partially well-defined margin and hypodense permeating areas, some with attenuation values compatible with soft parts, and others with liquefaction located in the left liver lobe.
MR imaging sequence with T2-weighted transversal. Imaging shows a hypointense signal originating in the peripheral region (arrow) and a dominant component associated with a hyperintense signal (*).
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F2
The center of the mass was far more intense in the late phase, probably due to slow flow through the vascular components (Figures 2 and 3).
(A) T1-weighted fat-suppressed MR imaging without contrast; and MR imaging after contrast in (B) arterial phase, (C) portal phase, and (D) late phase. In T1-weighted images without contrast, the signal in the periphery of the mass (arrow) is similar to the muscle signal; the center of the lesion clearly shows a hypointense signal (*). Although impregnation of both components began in the arterial phase, the peripheral region (arrow) showed a stronger signal during the arterial and portal phases, followed by signal decay in the late phase due to relatively rapid washout, indicative of hypervascularization. The enhancement of the central component is far more intense in the late phase (*), probably due to a large interstitial space and slow flow through the vascular components.
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F3
The center of the mass was far more intense in the late phase, probably due to slow flow through the vascular components (Figures 2 and 3).