[Multifocal motor neuropathy with conduction blocks and prurigo nodularis. A paraneoplastic syndrome in a patient with non-Hodgkin B-cell lymphoma?].

Multifocal motor neuropathy with conduction blocks (MMNCB) is a peripheral demyelinating neuropathy. The etiology of this disease is unknown, but an autoimmune origin is postulated. Prurigo nodularis (PN), a chronic dermatosis also having an unknown etiology and many peripheral neuropathies of different nature are associated to hematological tumors. We have found no cases in the literature in which MMNCB was presented as a paraneoplastic syndrome of a non-Hodgkin B-cell type lymphoma (NHL-B). We present the case of a 67 year old man who simultaneously developed PN and MMNCB in upper limbs and who was diagnosed of a NHL-B 19 months later. We raise the hypothesis that both prurigo and neuropathy are a paraneoplastic syndrome for lymphoma with a possible common autoimmune pathogenic mechanism.