Alzheimer's diagnosis: When's a good time to tell someone they have an incurable disease?

Last week, new guidelines for diagnosing Alzheimer's defined a "preclinical" stage of the dreaded disease. Evidently, the telltale pathology?in particular, the plaques that encroach on the brain?can be detected years, if not decades, before the patient ever forgets a familiar name or neglects to feed a pet.

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