Elderly men dance on the right side for 1 week. What are the reasons?

Thanks to the medical pulse nerve station friend @ The patient who shared the case: Peng, male, 66 years old.
Brief medical history: admitted to the hospital due to dance of the right limb for 1 week.

The right upper limb is obvious and cannot be controlled automatically, which seriously affects daily activities and disappears during sleep.

Physical examination: a previous history of hypertensive cerebral infarction, no dysfunction left.

Outpatient intravenous fasting blood glucose: 23.
56mmol/L; 2 hours postprandial blood glucose: 28.
07mmol/L.

Urine sugar 1+.

On March 24, April 11, and May 9, three MRI examinations showed short T1 signals in the left basal ganglia.

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