CNTNAP1 and chronic inflammatory demyelinating polyradiculoneuropathy: Autoimmune nodopathy (AN), as patients positive for IgG4 autoantibodies against NF155, NF186, CNTN1, or CASPR1, is a distinct form of chronic inflammatory demyelinating polyneuropathy (CIDP) that shares similar clinical and electrophysiological characteristics with Charcot–Marie–Tooth disease type 1 (CMT1).