CT imaging of intrabiliary growth of XXXX : a comparison of pathological findings of resected specimens.

@entity5 @entity1 @entity14
The objective of this study was to assess the usefulness of CT in the pre-operative evaluation of macroscopic @entity5 growth of @entity14 . 25 metastatic nodules of 18 @entity1 who underwent an initial hepatectomy for @entity14 were retrospectively evaluated. The CT appearance and pathological findings of the resected specimens were correlated. A number of unusual peritumoral features associated with @entity5 growth were detected by pre-operative CT. These were classified into three patterns: (1) thickened portal tract; (2) intrahepatic bile duct dilatation; and (3) a wedge-shaped area with enhancement. In 8 (32%) of the 25 nodules the portal tract was depicted as thicker than usual and these features were found proximal to the @entity5 in three instances, distal to the @entity5 in four instances, and both proximal and distal in one instance. All of the three @entity5 larger than 30 mm resulted in thickening of the portal tract. Intrahepatic bile duct dilatation was detected in association with 10 (40%) of 25 nodules. Bile duct dilatation was observed in more than one segment when @entity5 reached the hepatic hilus from the @entity5 . The presence of bile duct dilatation was not related to either the size of the @entity5 or the extent of @entity5 growth. An abnormally high density wedge-shaped area on contrast enhanced CT was another feature indicating @entity5 growth and was seen in association with four nodules. Such areas were seen in the liver parenchyma distal to the @entity5 on three occasions, or encompassing the @entity5 on one accasion. This wedge-shaped area appeared as a well demarcated dark red-brown region in the cut surface of the resected specimen. CT was useful for detecting the presence of @entity5 growth with these three patterns of radiological findings in @entity1 with liver metastases from @entity14
