Last Updated on March 26, 2026 by admin
Viggo was on the operating table at UC Davis Veterinary Teaching Hospital with a one-millimeter camera threading through his brain when the image on the monitor shifted. The surgeons saw what they came for: the third ventricle, swollen with fluid that had been slowly crushing a Maine Coon kitten’s brain since birth.
They made the cut. Fluid drained. And in that moment, three doctors — two veterinary neurosurgeons and one children’s brain surgeon who had never operated on a cat — opened a door that hadn’t budged in seventy years.
The Head That Kept Growing
Erin Cooper brought home a Maine Coon kitten with a head that seemed a little too big. Maine Coon owners know the breed runs large — big paws, big ears, big personality. But Viggo’s head kept growing.
An MRI confirmed what Cooper feared: feline hydrocephalus, a buildup of cerebrospinal fluid inside the brain. The pressure was compressing his brain tissue. Without intervention, most kittens with the condition are euthanized within months.
Cooper wasn’t ready for that.
The Surgery No One Had Tried on a Cat
Cameron Sadegh is a pediatric neurosurgeon at UC Davis Children’s Hospital. He treats hydrocephalus in human babies — the same condition, the same fluid, the same crushing pressure on a developing brain. The standard treatment for humans hasn’t changed in roughly seventy years: a permanent shunt drains the fluid from the brain to the abdomen, where the body absorbs it. It works. But it comes with a lifetime of complications, revisions, and repeat surgeries.
Sadegh had an idea no one had tested on a cat. Combine two procedures — endoscopic third ventriculostomy, which creates a new drainage pathway in the brain, with a temporary ventriculosubgaleal shunt that buys time while the brain grows. Once the brain matures, the new pathway should handle drainage on its own. No permanent hardware. No lifetime of revisions.
In May 2025, Sadegh joined veterinary neurosurgeons Ji-Hey Lim and Adrien Dupanloup in the operating room. Together, they guided an endoscope — a camera thinner than a pencil lead, just one millimeter wide — through Viggo’s skull and into his brain. They created a precise opening in the third ventricle and placed a small catheter to let the fluid disperse under the scalp.
The procedure took steady hands and a kitten-sized margin for error.
What the Follow-Up Showed
Months later, Viggo returned for an MRI. The images showed exactly what Sadegh had hoped: less fluid. Thicker brain tissue. The catheter still in place and working.
Viggo was not only alive — he was growing into the oversized, ridiculous Maine Coon he was always meant to be.
Why This One Got Through
Here’s the part that stops you: what worked in Viggo’s brain could work in a human baby’s brain.
The procedure Sadegh tested on a Maine Coon kitten could offer a new path for the roughly one in every 1,000 babies born with hydrocephalus — a path that doesn’t require a lifelong shunt. Cooper has said she feels awed knowing her kitten’s surgery might one day help the smallest and most vulnerable human patients.
Three surgeons, a one-millimeter camera, and a Maine Coon kitten who wasn’t supposed to make it past his first year. That’s how a seventy-year-old problem started to crack.
Viggo doesn’t know any of this, of course. He’s too busy being a cat — which, for a Maine Coon, means being the largest possible presence in the room at all times.
Does your Maine Coon think they’re the most important creature in your house? Tell us their name below. 🐱
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