Abstract
A 66-year-old woman who had been followed for fatty liver was detected to have a highly echogenic tumor in the segment 3 of the liver on an abdominal ultrasonography. An abdominal plain CT scan showed a low density area 55 mm in the maximum diameter with a heterogeneous inner portion at the same site of the liver that the ultrasonography demonstrated ; there was a high density part. Hepatic angiomyolipoma was likely, but a malignant neoplasm such as hepatocellular carcinoma was possible. Accordingly laparoscopy-assisted lateral segmentectomy of the liver was performed. The resected specimen involved a sharply demarcated tumor 55 mm in diameter. Histopathological study showed that the tumor had fatty tissue, spindle-shaped cells and the growth of vessels, with a part which had been encircled by a fibrous capsule-like structure. Immunohistochemical stainings were HMB-45 and α-SMA positive. Hepatic angiomyolipoma was thus diagnosed.
Hepatic angiomyolipomas are comparatively rare tumors, among of which the tumors extremely rarely have a capsule. Here we present a case of encapsulated hepatic angiomyolipoma.
