title: Methotrexate pneumonitis after low-dose therapy for rheumatoid arthritis.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000150:complications / Q000188:drug therapy*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D008297:Male; D008727:Methotrexate / Q000009:adverse effects* / Q000627:therapeutic use; D008875:Middle Aged; D011014:Pneumonia / Q000139:chemically induced* / Q000000981:diagnostic imaging / Q000473:pathology; D011658:Pulmonary Fibrosis / Q000139:chemically induced / Q000473:pathology; D013902:Radiography, Thoracic
chemical_list: D008727:Methotrexate