A middle-aged man with well-controlled diabetes mellitus was diagnosed with acute promyelocytic leukaemia (APML). He completed both induction and consolidation with all-trans retinoic acid (ATRA) and idarubicin, and was in remission. He was subsequently maintained on outpatient weekly low-dose methotrexate (25 mg/week) and 6-mercaptopurine. Six months later, he presented with fever and cough for 2 […]