Liver histopathology in autopsied drug-addicts.

Liver specimens of 150 randomly selected autopsied drug addicts from the province of Milan (Italy) were studied using light microscopy, polarized light and immunohistochemical methods. Simple histological changes and the main diagnoses are described. The main histological diagnoses in order of frequency were: non-specific reactive hepatitis (NSRH) (52%), chronic aggressive hepatitis (CAH) (24%), acute hepatitis (AH) (12%), normal liver (6%), steatosis only (3.3%) and cirrhosis (2%). In 24 cases (16%) one or more viral antigens (HBsAg, HBcAg and Delta Ag) were detected in hepatocytes by immunohistochemical methods. Three liver specimens revealed epithelioid cell granulomas, but in no case was birefringent material identified in the liver. AH and CAH were more frequent in the group of livers with viral antigens. Our histological and immunohistochemical data confirm the current opinion that, in most cases, liver pathology in drug addicts has a viral aetiology, while no significant pathogenic role has been identified for drugs, alcohol or contaminants. Recurrent infections by one or several viruses possibly explain the relatively peculiar histological features of hepatitis in drug addicts.