Spontaneous Cerebrospinal Fluid Leak

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Lisa Sanders, Brain Teaser. The man was acting strangely. His siblings thought he was drinking again. He swore he wasn't -- but then what was going on? New York Times Magazine, Nov 5, 2017.
https://www.nytimes.com/2017/11/ ... ior-so-strange.html

Note:
(a) diagnosis:
(i) CSF Leak: A Curable Cause of Headache. Cedars-Sinai , undated
https://www.cedars-sinai.edu/Pat ... se-of-Headache.aspx
("CSF leaks can happen after medical procedures, such as lumbar puncture (spinal tap), epidural injections or spine surgery. When it happens in these situations, however, it usually is easily found.  Sometimes, though, this type of headache occurs spontaneously, making diagnosis more difficult")
(ii) The en.wikipedai.org has a page titled "spontaneous cerebrospinal fluid leak."

(b) Cedars-Sinai Medical Center
https://en.wikipedia.org/wiki/Cedars-Sinai_Medical_Center
(1902- ; non-profit; 958-bed; section 1 History: Cedars of Lebanon and Mount Sinai Hospitals merged in 1961 to form Cedars-Sinai Medical Center)

(c)
(i) from the Web: "Dementia is not a disease itself, but a group of symptoms* * * It's a broad term that can be defined as a condition involving impairments in thinking, remembering, and reasoning, which affect a person's function"
(ii) "The most common type of dementia is Alzheimer's disease, which makes up 50% to 70% of cases."  Wikipedia

(d)
(i) CSF (clear, colorless; "125ml of CSF at any one time, and about 500ml is generated [read: secreted] every day")  Wikipedia
(ii) The origin and destination of CSF is hard to explained, unless one knows neuroanatomy.

(e) Brain herniation
https://medlineplus.gov/ency/article/001421.htm

, is the sign (again, not a disease) / end result, caused by either loss of CSF or increased pressure within the brain cavity (such as a tumor (anywhere inside the skull), or a hematoma (blood mass) within the brain by stroke, trauma as well as under the skull (from rauma) ).  Acute brain herniation may cause death.