I am undergoing very slow, frustrating, round about testing to discover the cause of headaches, sweating and chronic non infectious watery diarrhea. I had a colonoscopy a couple years back. All I remember was that dr. said he removed one tiny rectal polyp which was he said was benign. My question is whether a suspected rectal carcinoid tumor would be easily identified by just looking at it or would it require suspicion and special pathology biopsy tests to confirm or rule out a carcinoid.