Interferon-induced sarcoidosis.

Rheumatologists are increasingly asked to see patients with hepatitis C who exhibit a variety of clinical and serologic features that mimic systemic rheumatic disease. Treatment with interferons, now the standard of care, can precipitate a variety of inflammatory conditions, including sarcoidosis. We present a case of a 59-year-old former intravenous drug user who developed systemic sarcoidosis while receiving interferon alpha and ribavirin for the treatment of chronic hepatitis C. Because interferons are increasingly prescribed by specialists in a variety of disciplines, rheumatologists should be aware of their potential to induce sarcoidosis as well as various autoimmune diseases.