Sucks man. Wish you good luck and a quick recovery from the surgery.
I know about the breast cancer that men can have. I actualy went to the doctor once because my nipples were swollen and hurt. The doctor then checked my balls because it can be a symptom of testicular cancer.
My nephew also was recently diagnosed with a tumor one of his testicles. Turned out to be a harmless cyst tho. Was really crap the few days we had to wait for the results and didnt knew if he has cancer.