ERCP showed irregular borders of bile ducts(arrow head)and the band like structures(straight arrows) of the intra hepatic ducts with the paucity of side branches corresponding to apperanceseen in A.
thickening of right and left hepatic ducts(arrows).heterogenous enhancement of both lobes of the liver caused by cirrhosis or peri portal fibrosis.
(A)
open arrow=long segment of dilated duct without a normal branching pattern,this appearance of
cholangiographic pruned tree pattern. 
1-In the evaluation of patients with PSC, CT has a role complementary to that of cholangiography. Computed tomography is not as sensitive as cholangiography for detecting the subtle mucosal abnormalities of the bile ducts, and therefore it should not be used as a screening examination in patients suspected of having PSC. However, the multiple, tight bile duct strictures in PSC can preclude adequate evaluation of the intrahepatic bile ducts with cholangiography; it is in this group of patients that CT can be helpful in evaluating the extent of disease.
1-In the evaluation of patients with PSC, CT has a role complementary to that of cholangiography. Computed tomography is not as sensitive as cholangiography for detecting the subtle mucosal abnormalities of the bile ducts, and therefore it should not be used as a screening examination in patients suspected of having PSC. However, the multiple, tight bile duct strictures in PSC can preclude adequate evaluation of the intrahepatic bile ducts with cholangiography; it is in this group of patients that CT can be helpful in evaluating the extent of disease.2-The CT appearance characterised by presence of multiple areas of intra hepatic biliary dilatation in both lobes without any apparent connection to central ducts(skip dilatation).
Reference:BiblioMed Textbook-Computed Body Tomography
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