I'm def starting to see why not many people post on this forum. I do not presume to know everything about ferrets, I learn something new about them almost daily. I spend a lot of time researching health issues and have assisted my vet on more than twice the number of adrenal surgeries than you have dealt with. I don't consider the inability to urinate, aggression, mating behavior in neutered ferrets, or excessive grooming of other ferrets & humans to be subtle signs of adrenal, they are big red warning signs. I had one little girl who's only sign was that she smelled adrenal. My vet thought I was a bit nuts but he agreed to an exploratory and we found a large, aggressive, malignant tumor.
You need to improve your reading comprehension. The ferret that was posted about had a chordoma removed from his tail. Consequently that tail was most likely shaved for the surgery thus the reason there is no hair on it. It may not come back until the next shed or it may not come back at all. There is absolutely no reason for an ultrasound and to me, "Unfortunately a physical exam is not enough to rule out adrenal disease. An ultrasound needs to be done" does not sound like a suggestion but more like an imperative. You should also keep in mind that not all vets have ultrasounds and that in many areas they are more expensive than the actual surgery. If you want to waste your money, go right ahead. I really don't care. I prefer to do surgery when I see signs of adrenal however subtle those signs may be.
As far as my empathy, it's reserved for the poor boy who died a painful death because his not being able to relieve himself was too "subtle" for you to see.
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I've learned that I don't suffer from insanity, I enjoy it.