The pathology of liver allografts surviving longer than one year.

Although prolonged survival after liver transplantation is now common, the condition of allografts after prolonged survival has not been widely discussed. We reviewed 86 biopsy samples from 38 patients. The samples were obtained between 366 and 1,622 days after transplant. Thirteen patients' biopsy samples were normal or showed minor changes. Six patients' samples showed rejection. Four patients, including two with rejection, demonstrated ischemic change. Three patients showed focal fibrosis, polymorphonuclear infiltration and bile duct proliferation simulating biliary obstruction, although biliary stones were found in only one patient. Three patients had acute hepatitis. Seven patients had a pattern of chronic persistent hepatitis; four had chronic active hepatitis. Follow-up biopsy samples were obtained in seven chronic hepatitis patients. Two of the patients with chronic hepatitis patients. Two of the patients with chronic active hepatitis have shown slight progression of the disease. None has progressed to cirrhosis, but neither has the chronic active hepatitis resolved. It is likely that some of these cases represent non-A, non-B hepatitis. Although histological abnormalities are common after successful transplantation, the clinical significance of many of the changes remains to be determined. Only patients with rejection or vascular thromboses required new transplants.