In my husband's case all the reports kept coming back saying "consistent with lung cancer" so apparently no one checked to see if it could have been something else. A CA19-9 blood test would have shown easily that it was pancreatic cancer. Or a biopsy on the spot in the pancreas. But until we switched oncologists, those were not done and we had no reason/knowledge to request them. I don't have any experience with Mayo but would hope they are more on top of these things. Good luck to you!