Barrett's esophagus. A cancer risk.
D001471:Barrett Esophagus / Q000209:etiology / Q000517:prevention & control*; D004938:Esophageal Neoplasms / Q000209:etiology / Q000517:prevention & control; D005764:Gastroesophageal Reflux / Q000150:complications / Q000517:prevention & control*; D006801:Humans