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44-year-old lived normal life with brain mostly replaced by fluid sac [1]

['Mark Frauenfelder']

Date: 2025-09-11

The Whippet is a newsletter from McKinley Valentine of Melbourne, Australia. Each issue is a collection of marvelous miscellany. The most recent issue has a section about people who found out they have large portions of their brains missing despite living normal lives.

One example:

A 44-year-old man seeks treatment for weakness in his left leg. When the doctors hear he had hydrocephalus as a kid (water on the brain), they do an MRI just in case it's relevant. They discover that a fluid-filled sac has filled most of his skull, "leaving little more than a thin sheet of actual brain tissue".

The photo of the guy's brain is astounding.

Previously:

• Split brain explainer video: You Are Two

• The neuroscience of creativity (and yes, right brain/left brain is mostly bullshit)

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[1] Url: https://boingboing.net/2025/09/11/44-year-old-lived-normal-life-with-brain-mostly-replaced-by-fluid-sac.html

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