A case of hepatic angiomyolipoma difficult to distinguish from hepatocellular carcinoma

Figure 1 Images. A: The tumor was hypoechoic on ultrasonography, measuring 4.2 cm × 4.0 cm; B-C: Enhanced computed tomography showed a tumor with early-phase hyperattenuation and late-phase hypoattenuation; D-F: Magnetic resonance imaging showed a tumor with hypointensity on T1-weighted, hyperintensity on T2-weighted images and hyperintensity on diffusion weighted images; G: The tumor did not absorb iron on superparamagnetic iron oxide-enhanced MRI; H: On angiography, the tumor was shown as a circumscribed hypervascular mass.

Figure 2 HAML. A: The tumor occupied a large area of the caudate lobe; B-D: The histological features of the tumor showed that it was mainly composed of smooth muscle cells (B: HE stain, × 4; C: HE stain, × 40) and a small number of adipose cells (D: HE stain, × 40); E, F: Immunohistochemically, the tumor was positive for CD68 (E: CD68, × 20), and HMB-45 (F: HMB-45, × 100).