Chronic inflammatory demyelinating polyneuropathy mimicking a lumbar spinal stenosis syndrome.

A patient with chronic inflammatory demyelinating polyneuropathy (CIDP) established by biopsy developed cauda equina symptoms due to swelling of the nerve roots in the lumbar spinal canal. Magnetic resonance imaging of the lumbar spine showed profoundly thickened nerve roots from the level of the conus medullaris, filling the caudal thecal sac. Immunosuppressant treatment produced partial clinical and radiological resolution. This case shows that spinal compressive syndromes may occur in acquired hypertrophic neuropathies as well as in hereditary motor and sensory neuropathy and expands the range of the clinical presentation of CIDP.