Law of parsimony

...states that usually all symptoms and signs in a patient should be explained by a single diagnosis. It does not hold true in geriatric medicine as elderly may have a number of medical conditions at the same time.

Binswanger's disease

is dementia in elderly due to subcortical arteriosclerotic encephalopathy.

Quiz

What vaccine is recommended for elderly
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Pneumococcus vaccine to all above 65 years age