Years ago I ran across those extreme bilateral hydrocephalus cases you linked. As a neuroscientist, naturally they piqued my interest. I was skeptical then, and even moreso now. To my knowledge, in the years since those 2-3 cases popped-up, there has never been any follow-up on those original patients, and no similar bilateral cases have been found in the modern-era of brain imaging.

I will happily stand corrected if someone can provide any evidence from the last 10 years where any case like this has been documented and independently confirmed. Until then, I will continue to consider the brain important.