A 64-year-old woman presents to the GP for a six-month history of unsteady gait and fatigue. She has been smoking one pack of cigarettes daily for 30 years. Serum sodium is 131 (normal range: 135-145 mEq/L). Antibody screening for presynaptic voltage-gated calcium channels is negative. There is incoordination when performing the finger-to-nose test. Which of the following best explains this patient’s gait disturbance?
Hypomagnesemia
Hyponatremia
Metastatic malignancy
Normal pressure hydrocephalus
Paraneoplastic syndrome
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Cut-to-the-chase Answer (0:36):
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HY USMLE Answer (3:17):
