Sarcoidosis is characterized by multisystemic granulomatous lesions of
unknown etiology. A 62-year-old woman developed sarcoidosis after tre
atment with alpha-2a interferon (IFN) for 24 weeks (total dose: 522 mi
llion units) for chronic hepatitis C. She developed complete atriovent
ricular block and multiple noncaseating granulomatous lesions in the l
ung. IFN therapy, which may disturb cellular immune activation in some
patients, may have contributed to the onset and progression of sarcoi
dosis.