A. Your question is interesting, and I had to stop to do a bit of research because I've never heard of "primary" tracheal collapse in cats. It's a pretty common diagnosis in toy and small breed dogs, who tend to have weak cartilage in their trachea, but not in cats.
Cats *can* get a collapsed trachea, but it's usually due to other causes. Chronic coughing due to parasites (lung worms), infection, asthma - those are all possibilities. Trauma, such as from abuse or being hit by a car can cause it. Also cats can get masses in their chests and these can press on the trachea, causing it to appear narrowed on x-rays (which is how I'm assuming this "diagnosis" was reached).
I guess I'd encourage you to talk with your vet about what caused the collapse, in their opinion. That will ultimately answer your questions about whether it can be treated. If your vet doesn't know why your cat has a collapsed trachea then perhaps it's time to see a specialist, if possible.
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