Diagnosed with Horners Syndrome

I hope someone out there can shed some help with this diagnosis of Horner's Syndrome.  My 3 year old, Peanut, woke up last Monday with the pupil of his eye appearing to have dropped.

I took him to the vet on Wednesday and he was diagnosed with Horner's Syndrome.  After reseaching this syndrome on the internet for days now, everything I am reading points to blunt force trauma, which is not the case as I have raised in from a kitten and he is an indoor cat.  More frightening is the underlying causes like tumor, lesions, mass in the chest, etc.

My vet said his ears looked clean and that this condition may just clear up on its own.  If not, then I should look at diagnostic testing.  I am so upset over this.  He has not displayed any other symptoms; he is playing, eating, using the litter box, etc.  If I didn't look at his eye, I would never suspect a thing from his behavior.

I lost a little boy three years ago who was only 9 months old to FIP and I cannot endure the pain of losing this little guy; he is my whole world!!!  Is there anyone out there who has experienced this with good results?

Karen

what a beautiful boy,  I read that it can clear up on its own in some cases. I really hope that the underlying reason isn't serious. 

If you search the site, there are several threads on Horner's Syndrome and there are cases where it eventually cleared up.  Some of the threads are quite old so I don't know if the members are still active, but if they are, it might be worth sending them a PM and asking them about their experience.

Here are the first four I pulled up:
[thread="282248"]Horners Syndrome Third Eyelid  [/thread][thread="299830"]Horners Syndrome  [/thread][thread="36318"]Help My Sweet Aurora Has Horners Syndrome  [/thread][thread="150881"]Horners Haws Syndrome  [/thread]
Hopefully someone with actual experience will chime in with some helpful info here, but this might be a place to start.

Peanut certainly is a beautiful boy!   Fingers crossed this clears up quickly.  

Thank you so much in  providing the threads regarding Horners Syndrome.  I have read through most of them already.  I too am hoping someone chimes in with their experience of this situation.  It has been a week now and Peanut's pupil is still dropped, but thankfully he is playing, eating, and acting like his normal self.  I am praying hard and trying to keep my faith that this just clears up on its own without having to put him through a battery of tests.  He is not a happy kitty during vet visits.

thanks for the good wishes!