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According to Cytowic, "It is true that individuals who have balance and gait issues similar to those observed in Trump can have degenerative brain disease in the frontal lobes, such as fronto-temporal dementia or Pick's Disease. Other possibilities are normal pressure hydrocephalus, sensory ataxia, peripheral neuropathy, small lacunar strokes in the basal ganglia, supranuclear palsy, the effects of too many medications, and Parkinson's Disease, which can begin on one side and also show early cognitive impairment."

An M.R.I. showed nothing, except some other things, which had nothing to do with concussions or my symptoms, and which I’d probably have preferred not to know about: White matter intensity is generally preserved, however a solitary probable chronic lacunar infarction is present in the right caudate head, and trace probable microangiopathy is present in the parietal region on the left.

The stroke had occurred deep in the right side of his brain, in an area called the thalamus – a thalamic or lacunar stroke, in medical jargon.

“Lacunar amnesia? It means you can’t remember a specific event.”

“Remember when we talked about lacunar amnesia, or forgetting particular events? Apparently Mr. Curtain can use his machine to wipe out specific memories without taking away everything—without doing a complete brainsweep. It makes people dazed for a while, but then they get better, and the memories rarely come back.”