benign esophageal neoplasm; benign esophageal tumor; benign esophageal tumour; benign esophagus neoplasm; benign esophagus tumor; benign neoplasm of the esophagus; benign neoplasm of the oesophagus; benign oesophagus neoplasm; benign oesophagus tumour; benign tumor of esophagus; benign tumor of the esophagus; benign tumour of oesophagus; benign tumour of the oesophagus