Mitzi is a longtime survivor of lymphoma. It’s been five years since her last chemotherapy treatment, but she has been vomiting and her owners are afraid the cancer is back. Her stomach feels very weird – kind of doughy, like there is a big lump of bread in there. That’s not how tumors feel; tumors are usually firm. The X-rays reveal a mass, but it looks like strange material in her stomach. We decide to go in with an endoscope.