"methotrexate-induced pneumonitis: 1% of rheumatoid arthritis patients starting methotrexate 10. NSIP pattern and granuloma formation"
"ARDS"
"BAL may show an excess proportion of lymphocytes."
"CT features can be variable and included diffuse parenchymal opacification, reticular opacities, and centrilobular nodules 2. An NSIP pattern is considered the most common manifestation of methotrexate-induced lung disease 1."
"Previously, methotrexate was thought to cause pulmonary fibrosis; however, evidence (c. 2021) has not established a causative effect 10-12."