Introduction
Adult-onset Still’s disease (AOSD) is a systemic inflammatory disorder of unknown etiology that usually affects young adults.1 Spiking fever, arthritis, and evanescent rash are commonly observed during the course of the disease. Other frequently observed clinical features include sore throat, hepatosplenomegaly, lymphadenopathy, and serositis.2 Adult-onset Still’s disease is usually complicated by liver dysfunction.3However, cases of autoimmune hepatitis (AIH) complicated by AOSD are rare, and discerning the cause of liver dysfunction as AOSD or AIH is difficult. This was a very rare case that could be followed up from acute onset to recurrence of AIH complicated by AOSD. Herein, we report a case of AIH complicated by AOSD that was successfully diagnosed by a liver biopsy.