Chronic inflammatory demyelinating polyneuropathy (CIDP) is considered to be an autoimmune disorder of the peripheral nervous system. Central nervous system (CNS) involvement has been clinically observed in 5%  and 8% of patients and in many cases of CIDP, there is accompanying CNS demyelination with the presence of subclinical electrophysiological and magnetic resonance imaging (MRI) abnormalities.
Citation: Takeda M, Tachibana H, Tuda K, Wada S, Kasama S, et al. (2010) CNS Involvement in Chronic Inflammatory Demyelinating Polyneuropathy: A Visual Evoked Potential Study. J Neurol Neurophysiol 1:105