Different imaging findings of inflammatory myofibroblastic tumor of the liver

Figure 1 Ultrasonography images of the liver inflammatory myofibroblastic tumor. A: Conventional ultrasonography showing a 3.8 cm × 4.6 cm hypoechoic mass in the right anterior lobe of the liver, with a clearly defined border (white arrows); B: Arterial-phase images showing a hyperenhanced mass on the liver (white arrows); C: Portal venous-phase images showing slight enhancement and wash-out of the mass, which corresponded to that seen on arterial-phase images (white arrows); D: Parenchymal-phase images showing further wash-out of the mass, which corresponded to that on arterial-phase images (white arrows).

Figure 2 (Fluorine 18) fluoro-2-deoxy-D-glucose positron emission tomography and computed tomography images of the liver inflammatory myofibroblastic tumor. A: Coronal positron emission tomography (PET) demonstrating an intense (fluorine 18) fluoro-2-deoxy-D-glucose (¹⁸F-FDG) uptake with SUV standardized uptake value in the anterior segment of right lobe of the liver; B: Axial PET demonstrating an inhomogeneous intense ¹⁸F-FDG uptake; C: Axial computed tomography (CT) demonstrating a round mass with low density; D: Axial PET/CT demonstrating an inhomogeneous intense ¹⁸F-FDG uptake in the anterior segment of right lobe. R: Right; L: Left; A: Anterior, P: Posterior; H: Head; F: Foot.

Figure 3 Axial contrast enhanced computed tomography images of the liver inflammatory myofibroblastic tumor. A: Axial arterial phase images showing a hyperenhanced mass well defined at the periphery of the mass; B: Arterial phase images showing a liver lobe artery (dash arrow) around the mass and the front edge of the mass lay a low density nodule (solid arrow) not enhancing in three phase images; C: Axial portal venous phase images showing a further enhanced corresponding to the arterial phase images; D: Axial delayed images showing obviously wash-out corresponding to the arterial phase images.

Figure 4 Histopathology findings of the liver inflammatory myofibroblastic tumor. A: Lesion was composed of chronic inflammatory cells and spindle cells (hematoxylin and eosin stain, × 200); B: Spindle cells were positive in smooth muscle actin tumor (immunostaining, × 100).