Schrodinger's Cat and Deauville 5 Point Scoring

•The Deauville 5 point score is a simple, visual assessment tool for determining FDG PET imaging response in high grade lymphomas.•Even minor inconsistencies in quantitative metrics used can result in discordances in scoring results and consequently treatment adequacy.•Radiologists should discuss the selected paradigm for scoring posttreatment scans with Lymphoma specialists to inform management decisions.