Norman Barrett: Norman Rupert Barrett (1903–1979) was an Australian-born British thoracic surgeon who is primarily remembered for describing Barrett's oesophagus.Acute esophageal necrosisIntestinal metaplasia: 200px|right|thumb|Intestinal metaplasia (top middle of image) of the gastric antrum and [[stomach cancer|adenocarcinoma of the stomach (left/centre of image). H&E stain.Epithelial dysplasia: Epithelial dysplasia, a term becoming increasingly referred to as intraepithelial neoplasia, is the sum of various disturbances of epithelial proliferation and differentiation as seen microscopically. Individual cellular features of dysplasia are called epithelial atypia.Adenocarcinoma of the lung: Adenocarcinoma of the lung (pulmonary adenocarcinoma) is a common histological form of lung cancer that contains certain distinct malignant tissue architectural, cytological, or molecular features, including gland and/or duct formation and/or production of significant amounts of mucus.Angle of His: The angle of His is the acute angle created between the cardia at the entrance to the stomach, and the esophagus. It forms a valve, preventing reflux of duodenal bile, enzymes and stomach acid from entering the esophagus, where they can cause inflammation.Stretta procedure: Stretta is a minimally invasive endoscopic procedure for the treatment of gastroesophageal reflux disease (GERD). A catheter is used to deliver radiofrequency energy to the lower esophageal sphincter, muscle and gastric cardia.Tumor progression: Tumor progression is the third and last phase in tumor development. This phase is characterised by increased growth speed and invasiveness of the tumor cells.EsophagectomyHiatus herniaEsophageal disease: Esophageal diseases can derive from congenital conditions, or they can be acquired later in life.Esophageal strictureEndoscopy unit: An endoscopy unit refers to a dedicated area where medical procedures are performed with endoscopes, which are cameras used to visualize structures within the body, such as the digestive tract and genitourinary system. Endoscopy units may be located within a hospital, incorporated within other medical care centres, or may be stand-alone in nature.