Back Neck and Spine
Care of Mice and Rats
Urinary System

What would cause a pet mouse to have a kidney bean-sized lump on its neck?

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Wiki User
February 26, 2007 8:22PM

We are not veterinarians but I highly suggest you take your mouse into one right away. It may be a fatty growth and hopefully nothing more serious. If you can't afford to pay the vet then be up front with them when you go in and work the bill off!