Severe CIDP-MGUS responsive to Rituximab.

Chronic inflammatory demyelinating polyneuropathy (CIDP) is a relatively rare disease with progressive limb weakness and sensory loss. A few patients show a severely progressing course without major response to intravenous immunoglobulin or plasma exchange therapy. CIDP-MGUS (monoclonal gammopathy of undetermined significance) is a seldom CIDP variant that has been rarely addressed in therapeutic studies. In the presented CIDP-MGUS case, B cell depletion with rituximab had a favourable effect on the disease course, clinically and in nerve conduction studies.