CIDP, or demyelinating polyneuropathy, is categorised as an autoimmune disease manifested by progressive limb paresis. The development of the disease, from the appearance of the first symptoms to the full picture, can take about two months, which is an extremely short time. Diagnostic tests in the form of ENG or MRI and biopsies are key to making a diagnosis, which is crucial for therapy. Treatment for children does not differ from the regimen adopted for adults and, moreover, it is in children that it has been shown to be more effective.