An extranodal lymphoma that arises from the esophagus with the bulk of the mass located in the esophagus. Dysphagia may be the presenting symptom. The vast majority of cases are diffuse large B-cell lymphomas and B-cell lymphomas of the mucosa-associated lymphoid tissue. The disease is Monarch Disease Ontology id MONDO_0001188 (esophagus lymphoma). Also known as: esophageal lymphoma, lymphoma of esophagus, lymphoma of oesophagus, lymphoma of the esophagus, lymphoma of the oesophagus, primary esophageal lymphoma.