A case of isolated λ-light chain proteinemia and proteinuria is reported. During a 42-month follow-up, no sign of myelomatosis or amyloidosis developed and Bence Jones proteinuria remained nearly of the same magnitude. This case of apparently idiopathic Bence Jones gammopathy, the first of λ-type so far reported, is added to similar observations to give further support to the contention that a benign counterparty to light-chain myeloma may exist.
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