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(A) Serum electrophoresis before treatment initiation demonstrating a monoclonal M-paraprotein of 0.61 g/dL. (B) Cerebrospinal fluid (CSF) electrophoresis showing a monoclonal component in the gamma region; immunofixation revealed immunoglobulin M and kappa light-chain monoclonal bands. (C) Serum electrophoresis after 6 months of treatment initiation showing disappearance of the monoclonal band, whereas serum immunofixation was negative.
