One side effect of the immunomodulatory effect of interferon is the possible triggering or exacerbation of systemic or cutaneous sarcoidosis. We report two new cases and offer an exhaustive review of the literature. A 39-year-old man with type C chronic active hepatitis developed new respiratory symptoms and pulmonary infiltrates with hilar and mediastinal adenopathy after 7 months of treatment with pegylated interferon. The evolution was favourable after stopping treatment. The second patient developed cutaneous lesions after 6 months of treatment. Resolution occurred after the discontinuation of the treatment. In these two cases ribavirin was stopped before the first signs of sarcoidosis.
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