Overlapping syndrome of autoimmune hepatitis and primary sclerosing cholangitis associated with pyoderma gangrenosum and ulcerative colitis.

We describe the case of a 18-year-old male patient who first presented with decompensated cirrhosis, fever and generalized lymphadenopathy. He had abnormal results for liver biochemical tests, with a hepatitic-like picture and high titre of antinuclear antibodies. According to the scoring system proposed by the International Autoimmune Hepatitis Group he had 'definite' autoimmune hepatitis and responded well to immunosuppressive treatment. One year later he developed pyoderma gangrenosum which was successfully treated with cyclosporine. Two years later he experienced bloody diarrhoea as a first presentation of ulcerative colitis. At that time both the cholestatic biochemical picture and the cholangiographic appearances of the biliary tree were consistent with primary sclerosing cholangitis. Despite the addition of azathioprine and ursodeoxycholic acid to his treatment regime he developed recurrent episodes of cholangitis and intractable pruritus for which he underwent successful liver transplantation.