Imaging findings of biliary hamartomas

Figure 1 A 51-year-old man with VMCs. A: B-mode US showed multiple small hyper- and hypoechoic lesions less than 10 mm in diameter with multiple comet-tail echoes; B: On plain CT, multiple small hypodense lesions scattered in the whole liver especially in the subcapsular area of posterior segment of the right liver lobe; C: On enhanced CT, the small lesions became well delineated when compared with that on plain CT. No enhancements were noted in these lesions; D: T2-weighed image revealed multiple small lesions with high signal intensity; E: After gadolinium administration on T1-weighed image, hypo-intensity of the lesions was clearly shown without contrast medium enhancement; F: Hepatobiliary scintigraphy by using 99mTC-PMT showed normal appearances of biliary system without pooling areas; G: On histology, multiple irregularly dilated bile ducts lined by a single layer of cubic epithelium were shown.

Figure 2 A 72-year-old man with VMCs. A: On B-mode US, multiple small hyperechoic lesions were shown, while hypo-echoic lesions were not evident on the conventional scanning plan. However, with the use of zoom function, the hypoechoic lesion with comet-tail echo was clearly shown (arrows); B: On MR cholangiopancreatography, multiple small hyper-intensity lesions were revealed except for the demonstration of normal intrahepatic and extrahepatic bile ducts. In addition, several small cysts in the right kidney were also shown.

Figure 3 A 44-year-old man with VMCs. A: B-mode US scan with routine depth showed a vague image of multiple small hyper- and hypoechoic lesions. When magnified by using zoom function, the tiny hypoechoic lesion and the comet-tail echo were clearly seen (arrows); B,C: Multiple tiny hypodense lesions were displayed more conspicuously on enhanced CT (C) than on plain CT (B), and no enhancements were found in the lesions (C); D,E: the lesions.