...cancer or benign? When we did xrays to do prelinary work before surgery for a very small mast cell tumor on my cat's head (he has a good appetite, heart normal, breathing normal, etc), a large shadow showed up (in all 3) indicating a primary lung tumor. We see the Internist in a few days, but the cat's blood work is perfectly normal. My primary vet said that had it not been for the x-ray, she'd never guess anything was wrong. No cancer cells in the blood work. This confuses me, a I figured it must be a part of the other cancer and metastasized, but that would show in the blood, right? Do cats have benign lung tumors? He is acting SO NORMAL...running, playing, eating, etc. BTW, he is nearly 13.

The vet needs to do a biopsy to be sure. Better to be safe than sorry. I wish you and your kitty the best of luck.

You won't be able to tell without a biopsy....A lot of tumors won't show any affects ofn health unless they begin to cut bloodflow or in this case airflow to the affected organ...but there is really no telling...just watch him carfully and go with what your vet has to say...he is fairly old...you probably wouldn't extend his life a lot by treating him...I would just make sure if he gets worse .....not to let him suffer.