Rat problem Ill?

I have one of the hairless rats, that has a huge belly, and is getting skinny. She is a friendly little bugger and I have only had her a little while.
I knwo I saw something here before about a mouse that had a disorder and all, but I was wondering..
Does that occur in rats as well?
What are all the symptoms?
If it is that same thing then I will put her down, as I do not want her to suffer, and I am afraid that it is the same as the mouse I saw on here.
She is young, but well after weaning, so I wanted to know if anyone had any idea of how long one would survive? THe mouse I seem to remember looked pretty well half-way to mature, which would be consistant with this one too.
I will take a picture tomorrow to put up, but any ideas, advice?
Thank you!
Wolfy

could she have megacolon? here is a link with info: http://ratguide.com/health/digestive/megacolon.php.

Yes, THAT was the link I located here as well. I am pretty sure now reading through the entire thing that this is the problem. She is a very sweet rat and the oly one of my hairless that runs up to get attention. I will euthanize her tomorrow.
Thanks for the help, I will get a picture before so people can see what it looks like on a rat sans fur.
here are two pics, one is blurry, bc she moves a LOT.
http://img.photobucket.com/albums/v6...lessRatMC2.jpg
http://img.photobucket.com/albums/v6...rlessRatMC.jpg

Wolfy