title: Methotrexate-induced severe pneumonitis.
mesh_terms: D002675:Child, Preschool; D006801:Humans; D007945:Leukemia, Lymphoid / Q000188:drug therapy; D008297:Male; D008727:Methotrexate / Q000009:adverse effects*; D011014:Pneumonia / Q000139:chemically induced* / Q000473:pathology
chemical_list: D008727:Methotrexate