Mouse Has A Suspicious Lump

I have a pet mouse and recently a very large growth (about half the size of her head) has appeared behind her ear on her neck. Have you any ideas what this could be? Should I take her to the vet? She still appears to be eating and drinking. Is there any thing that a vet could do? (Kelly Greer - United Kingdom)

If you are able to gently touch it, you will be able to tell if it is hard or soft. If it is soft, it may be a cyst which could be relatively harmless - your vet may be able to drain it. However, rats and mice are fairly prone to developing tumors - if it is hard to touch, your mouse might have a dangerous tumor. The fact that it has reached this size would suggest the outlook would not look very good for your mouse. However, only the vet will be able to tell you what exactly is wrong with her - so don't delay.

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