signs of esophagitisesophageal stricture definitionesophageal stricture pathophysiologyesophageal adenocarcinoma symptomsesophageal hypersensitivity symptomsesophageal reflux symptomsesophageal perforation symptomssymptoms of esophagitis canceresophageal lesions symptomsesophageal ulcer symptomsesophageal hernia symptomsesophageal rupture symptoms