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The case is a 65 years old man. He noticed muscle weakness of lower limbs from 3 years ago. Dysesthesia was developed, He came in our hospital in X year. He was detected muscle weakness, sensory disturbance in distal lower limbs predominance and detected radicular significant swelling in spinal cord MRI and diagnosed it with chronic inflammatory demyelinating polyneuritis (CIDP). In the follow-up purpose of other diseases regularly, it was confirmed that nerve root was gradually swelling from around 7 years before the onset. The radicular swelling is one of the characteristics in CIDP, supports the diagnosis. This case was the valuable case that was able to chase image progress before the onset.