[The neuropathies of monoclonal gammapathies. Immunofluorescence and immunolabelling in the electron microscopy of immunoglobulins with amyloid structure (author's transl)].

Five cases of peripheral neuropathies occurring with monoclonal gammapathies are studied by means of nerve biopsies. Immunofluorescence and HRP-immunolabelling with the electron microscope are performed. The direct pathogenic role of a subperineurial immunoglobulin deposit is pointed out. The relationship of the heavy chain monoclonal immunoglobulin with amyloid fibrils is discussed.