I have a female cat named Wobbly that i rescued. I noticed she walked like a drunk Sailor leaving the bar at closing time. She always seemed healthy and ate and drank and used the litter box so i was not worried. I took her in to the vet to be spayed and I mentioned her strange symptoms and the vet recommended i not have her put under anesthesia in case whatever neurological disorder she had caused her to die during surgery. It was suggested i take her to a Vet Neurologist to see what was wrong, but it would have costs $$$$$$ and i just could not afford it. She was healthy and was luckily now and indoor only kitty so she could be kept away from unfixed males.
Because of a huge Vet screw up, they said they fixed one of my males, only to find out they hadn't(long story!!!) Well Wobbly ended up get pregnant. I called the vet as they knew her situation and when they realized their mistake with the male kitty they agreed to take care of Wobbly during her pregnancy. She went a week over due so the vet said she needed to C/section her and we would have to risk the anesthesia. She survived(thank goodness) but 3 or the 4 babies died shortly after birth. 2 were severe siamese twins and one looked perfect but died. The 4th is now a rambunctious stinker that i hand raised(Wobbly abandoned him) from birth. The point of my story is the new vet said that Wobbly was probably born to a mother that had distemper while pregnant. There is a name for Wobblys condition, but i would need a college degree to know how to pronounce it. It caused some neuological and is the reason her kittens were mostly abnormal. Wobbly was spayed during the c/section and we did get her delightful little boy out of the experience. She is as Wobbly as her named would suggest still, but is healthy and happy so i dont worry. Her one surviving kitten, named "Kitten" has no health issues beyond that he has a love hate relationship with his own tail! go figure!?