We report on a so-far never described association between glomerulonephritis and sarcoid-like lung disease after long-term interferon beta (IFNb) treatment for relapsing–remitting multiple sclerosis. The interest in this case resides in the documented remission after IFNb discontinuation. The history of IFNb-related adverse events is probably not yet completely written. The rapid reversal of the pathological signs in our patient underlines the importance of careful clinical and laboratory surveillance, including kidney functional parameters, for an early diagnosis of IFNb-related diseases.
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