Rainbow came through her surgery like a champ! The tumor was a lipoma, a fatty tumor, with no muscle or bone involvement. The dr checked it out and didn't even recommend sending it in for analysis.
Glad things went well at the vets! If in doubt though, it's always best to send in a sample for peace of mind.
My bourke hen had a large mass on her food and when my a-vet did a biopsy on it, it came back clear. We did laser surgery to remove it, and my a-vet didn't feel it was worth it to send the mass in, either... yet, I insisted, for peace of mind. It came back cancerous. And of course the mass grew back! Not as large as it previously was, but still, it's back, and I wont put her through surgery again, as it would probably kill her.