Abstract: 　Objective To examine the pathological changes in the liver of an AIDS patient with complicated infection of Pneumocystis carinii(PC). \ Methods\ A liver biopsy was made. The tissue was stained with HE, PAS, Giemsa, GMS, and acid-fast staining, and examined under light microscope and transmission electron microscope. \ Results\ Granulomas (acid-fast negative) in the tissue and numerous pathogens (PAS positive) in hepatic sinusoids were detected. Giemsa and GMS staining and electron microscopy all confirmed that the pathogen was Pneumocystis carinii. \ Conclusion\ The pathological findings revealed a diffuse extrapulmonary infection of Pneumocystis carinii in the patient of AIDS.

Key words: AIDS, Pneumocystis carinii (PC), liver, pathology