Post-liver transplantation de novo hepatitis with overlap features.

The development of de novo autoimmune liver disease after liver transplantation (LT) has been described in both children and adults. Reported herein is a case that is best characterized as post-LT de novo hepatitis with features of autoimmune hepatitis (AIH)-primary biliary cirrhosis (PBC) overlap. A 56-year-old man underwent LT for decompensated liver disease secondary to non-alcoholic steatohepatitis. His liver function tests became markedly abnormal 8 months after LT. Sequential liver transplant biopsy findings were confusing and shared findings seen with both AIH and PBC. Although standard autoimmune serological tests were negative, a dramatic biochemical response was observed to a regimen consisting of prednisone, mycophenolate mofetil, and ursodeoxycholic acid added to maintainance tacrolimus. The donor was histocompatibility leukocyte antigen, DR4, positive, a haplotype associated with the development of AIH-PBC overlap syndrome. In conclusion the authors believe that this may be a case of post-LT de novo overlap syndrome of AIH-PBC, a novel 'autoimmune-type' response.