Fig. 4

Magnetic resonance imaging shows the mass was globally hypointense on T1 weighted images, with some foci of increased signal intensity (A). Mildly heterogeneous, with predominantly high signal and some internal elongated (or linear) hypointense structures are shown on the T2-weighted images (B). Diffusion weighted images (b = 1000 s/mm²) demonstrated a heterogeneous pattern of increased diffusion, more prominent in the periphery (C). Multiple dilated and tortuous nutrient arteries were observed in the enhanced scanning arterial phase (D). Multiple foci of enhancement, with flaky appearances were observed in the portal phase (E). In the delayed period, continuous enhancement is seen in the lesions, with obvious enhancement at the edge (F)