Chronic inflammatory demyelinating polyneuropathy

In 12 cases of CIDP under surveillance for 14 years, the main nerve biopsy findings were endoneural oedema and demyelination of nerve fibres. IgM deposition was found in 1 patient and IgG deposits in another. Electron microscopy revealed proliferation of the Schwann cells and mononuclear cell infiltration. The diagnostic criteria and nerve biopsy findings in CIDP are listed in the tables.