When an elderly patient complains of weakness.
D000367:Age Factors; D000368:Aged; D005684:Gait; D006429:Hemiplegia / Q000209:etiology*; D006801:Humans; D009135:Muscular Diseases / Q000209:etiology*; D009422:Nervous System Diseases / Q000150:complications* / Q000175:diagnosis; D010808:Physical Examination / Q000379:methods; D011128:Polyradiculopathy / Q000175:diagnosis