[Benign monoclonal gammopathies. Case reports].

30 cases of patients presenting a benign monoclonal gammopathy (b.m.g.) have been studied, stress being laid on concomitant conditions, cases with likely typical symptomatology, atypical variations over time in certain patients of the monoclonal Ig level, and cases which, before they can be called benign, need further controls. Two cases of transitory b.m.g., one in a child, with double polymerization state, are also presented.