Mouse Massive Body Swelling

Question
I have a "pet" wild mouse that we have had for almost 4 years.  She has outlived about 10 domestic "cage" mates over this time.  In the last week I noticed her body has swollen to the size of a small tennis ball.  She can't even fit in the "tubes" in her cage.  She is still eating, but I would like to try to help her if further if you have any idea what is afflicting her and how to treat.  I know you are not a vet, but I thought perhaps you had come across something like this in your 35 years.  I checked several medical websites (animalhospitals-usa.com) and none of the diseases listed describe her situation.  

Thank you for your help.

Answer
Dear Vicki,

I am so sorry to hear about your afflicted mouse.  If she puffed up suddenly, it definitely isn't a good sign.  While it may be something untreatable, like an abdominal tumor, it may be something that a vet could fix, like internal bloating or infection.  Please take her to the vet if you can.  

Best of luck and health to your little mouse.

squeaks,

Natasha