A 40-year-old woman treated for many years for gastroesophageal reflux develops dysphagia and weight loss. Previous esophagoscopy has revealed cellular atypia. An esophagoscopy is about to be performed. What is it most likely to reveal?
Adenocarcinoma, originated from islands of Barrett's esophagus, is today the most common cancer of the esophagus in the United States.