They couldn't have thought ahead and just biopsied the tumor rather than put the fish through the whole ordeal when they are just going to put it down if it's cancerous anyway? I guess practice is a good enough reason but it just seems excessive. I hope I never need surgery in China.
"So, good news! We were able to remove the tumor and the limb it was attached to. I see the look on your face, don' worry prosthetic legs have come a long way and you won't even know it's gone. Also, the tumor was benign, so YAY, thumbs up right? That must be a huge load off your mind, glad we could help."