72 years old female with difficulty walking for few years

72 year old female is having progressive difficulty walking and pain in the toes. She recently had a fall and her son took the patient to the primary care doctor. First few years the doctor stated its old age. But when patient got worse to the point she needed a cane, the doctor checked the labs and XRay of spines. Results were baseline and patient was diagnosed with arthritis. Not satisfied the son requested a neurology consultation and the patient was seen by an expert neurologists who on exam found patient had bilateral foot drop and sensory loss in both feet and distal legs. NCV test was done and CIDP was diagnosed. Patient showed improvements 2-3 months after the initiation of IVIG infusion therapy.