“In 2018 at the age of 48, many years after the onset of of various gastrointestinal problems while working at very high altitude atop Mauna Kea, I had a colonoscopy that removed a 5mm polyp from the sigmoid colon.” AstronomyOshaAltitudeMaunaKeaTmtGastrointestinalColonColonoscopySigmoid Author:Steven Magee