Good news, the lumps were grade IIa but with clear margins. (clear margins mean we got all the bad cells) I would prefer grade I but I'll take it since it is better than III. According to the report 80% of mast cell tumors are grade II. While I can't say I understood the whole report, the doctor explained it to me and was happy with the results so I feel pretty good about them too. (Not that I will stop researching info on my own because that's just how I am.) He explained we just have to keep a close eye on her for any reoccurance and if any new lumps show up we need to get them off her quickly.