He only found out when he went to see a doctor because of a weak left leg

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The full story:

Experts said his brain tissue was severely compressed by fluid, not physically gone.

• The man suffered from chronic hydrocephalus “water on the brain" from a young age. As a child, he had a shunt in his head to drain fluid, which was removed at age 14.
• Over the next 30 years, fluid slowly accumulated and compressed his brain tissue into a thin, outer layer, rather than destroying it.
• Because compression happened gradually, his brain adapted and remapped functions to the thin remaining layer of tissue. The remaining 10% assumed functions for the entire brain.
• While his IQ was tested at 84, which is slightly below the average range (85–115), it was high enough for him to live independently, raise a family and work a government job.

Edited 2 hours ago by integral