A rare non-Hodgkin lymphoma that arises in and is confined to the lung at the time of diagnosis. Representative examples include bronchial mucosa-associated lymphoid tissue lymphoma and diffuse large B-cell lymphoma. The disease is MONDO_0020644 (lung non-Hodgkin lymphoma). Also known as: lung non-Hodgkin's lymphoma, non-Hodgkin lymphoma of lung, primary lung non-Hodgkin's lymphoma.