Mass-forming cholangiocarcinoma. (a) Contrast material–enhanced computed tomographic (CT) scan shows bile duct dilatation with a poorly enhancing lesion in the adjacent liver (arrows). There is significant parenchymal atrophy with capsular retraction peripheral to the more centrally located cholangiocarcinoma.(b) Photograph of the gross specimen clearly depicts a large mass (arrowheads) around the sclerotic bile duct. 管周浸润型常仅见局部胆管壁不规则增厚,官腔狭窄,界限不清,远端胆管扩张。增强扫描呈树枝状或长条状强化。偶见点片状高密度结石影。肝包膜可回缩内凹,因肿瘤内纤维间质较丰富,浸润生长牵拉局部肝包膜所致。