Dr. Roach: Man weighs whether to continue getting repeat colonoscopies

Dear Dr. Roach: I'm a 78-year-old male with a history of high blood pressure, and I had a bovine aortic valve replacement in 2009. I had a negative colonoscopy in 2003, but in 2013, my colonoscopy required a polypectomy of a 3-mm tubular adenoma. In ... [3239 chars]