Figure 11.

Inflammatory pseudotumor in a 68-year-old man. In the T2-weighted image (A), a round lesion (arrow) is seen in the central part of the liver segment VIII. A central necrotic area can be seen surrounded by an irregular rim, which is isointense in the plain T1-weighted image (B), well-vascularized in the arterial phase (C), and has a persistent enhancement in the portal–venous phase (D). In the DWI, only the central necrotic part (arrow) shows high signal intensity, while the peripheral rim is isointense with the surrounding liver parenchyma (E). Hematoxylin and eosin (H&E) staining (F) showed inflammatory pseudotumors rich with myofibroblasts and inflammatory cells (dashed arrow). The normal liver parenchyma is also marked (arrow); original magnification ×40 (F).