OLD THREAD
Seeing as the old thread was from 2015, I decided to make a more detailed submission of hydrocephalus

What is Hydrocephalus?
From Vetstreet: "Hydrocephalus, which literally means “water on the brain,” is a buildup of fluid inside the skull. This accumulation puts pressure on the brain, causing signs such as an enlarged, dome-shaped head, seizures, blindness, and behavioral changes."

Hydrocephalus can exist in, as far as I know, any mammal. Humans, cats, dogs, squirrels- just some examples of what I've personally seen. Prognosis is typically very, very poor, usually even with treatment. These cants can live to adulthood, but with serious problems.

It isn't always fatal without (serious) intervention, as seen in Benny(link is SFW/no gore).

What does it look like?
Now, if you go on Google Images, you can find some real horror shows- again, this has a poor prognosis. However, hydrocephalus varies! It can be as minor as Olaf here:


SOURCE

To more extreme, like Zeke:


SOURCE

What are your plans for this mutation?
Now, let's be realistic. Benny, the cat I linked, has relatively moderate-to-mild hydrocephalus- and the fact that he had lived to 5, as of the time of the article's writing, was praised by his human as a 'miracle'. This does not have a good outcome, and I'd imagine it has much less of one in the wild.

This would ultimately be lethal. While I would love for these little cuties to live into adulthood, I had two plans:
1.) Dying at a set number of days during childhood, as with the majority of lethals.
2.) Dying at a random age in early adulthood.

I'd like your input as to which would be better, but I WILL NOT BUDGE that this should be fatal. A more extreme or gorey form of art could be available depending on if they die in very early childhood (like Cyclopia), or something more like Zeke could pass in mid-late childhood, if not even up to adolescence.

MAKE SURE TO TELL ME WHY YOU DON'T SUPPORT!