Most tumors on rats are benign-- but we've had our share of non-cancerous lumpectomies.

This article on Surgery in Rats
<> should help you know what to expect for your girl during her surgery and while she is recuperating. The following articles will also explain more about tumors in rats:

Tumor Removal and Baytril:
Tumors in Rats:

Lastly, a very graphic site showing a surgical removal of an ovarian tumor and some mammary tumors (not for the squeamish):

I know it's pretty scary for the rat's humans the first time you take a rattie in for surgery. Please write to rat-help if you have any more questions.