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Imaging of hepatic PEComa. (A) Contrast-enhanced phase of CT reveals a poorly-defined mass with a significantly high intensity in segment VII of the liver. (B) The liver mass in segment VII revealed a strong enhancement in the contrast-enhanced phase of the MRI. PEComa, perivascular epithelioid cell tumor; CT, computed tomography; MRI, magnetic resonance imaging.
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However, the intensity of the lesions increased significantly in the contrast-enhanced phase (Fig. 1A). T1-weighted image and a slightly high signal on the T2-weighted image. The enhancement of intensity of the lesions was also observed in the contrast-enhanced phase of MRI (Fig. 1B).
Immunohistochemical results of hepatic PEComa (x200). (A) Tumor cells showing strong and diffuse positive staining for HMB-45 (+++). (B) Tumor cells showing strong and diffuse positive staining for SMA (+++). PEComa, perivascular epithelioid cell tumor; HMB-45, human melanoma black-45; SMA, smooth muscle actin.
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Immunohistochemistry further revealed that the mass in segment VII was strongly positive for human melanoma black-45 (HMB-45; +++; Fig. 2A), smooth muscle actin (SMA; +++; Fig. 2B) and vimentin (++).