Pathology General b79190f1 In which of the following conditions " Onion Skin" fibrosis of bileduct is seen A Ulcerative collitis B Primary sclerosing cholangitis C Primary biliary cirrhosis D Cholangiocarcinoma High-Yield Explanation Concentric periductal fibrosis is known as onion skin fibrosis and is classical of Primary sclerosing cholangitis.