Differential diagnosis: Conditions that must be considered in the differential diagnosis include Anti-MAG IgM neuropathy, diabetic neuropathy, hereditary neuropathies (e.g., Charcot-Marie-Tooth disease (CMT) 1, CMTX1, CMT4, metachromatic leukodystrophy, Refsum disease, adrenomyeloneuropathy, ATTRv polyneuropathy), POEMS syndrome, and vasculitic neuropathy. This evidence concerns the gene MAG and POEMS syndrome.