 The main objective of this pilot study is to provide a descriptive analysis of the morphology of the nerves with an ultra high frequency ultrasound in subgroups of CIDP patients, anti-MAG antibodies and neuropathy NMMBC and controls. The thickness of the epineurium, the hallmarks of fascicular organization, Doppler vascularity, the nerve-sectional area, the specification of the section surface, nerve hypertrophy, the thickness of the perineurium and ultrastructural characterization of the different fascicular organization typologies will be well analyzed in order to better understand the specific sonographic characteristics of each disease compared with controls, no data exist at present in the literature with such image resolution. 