The use of passively scattered proton therapy (PSPT) or intensity modulated proton therapy (IMPT) opens the potential for dose escalation or critical structure sparing in thoracic malignancies. While the latter offers greater dose conformality. dose distributions are subjected to greater uncertainties. especially due to interplay effects. https://www.jmannino.com/mega-save-Stephen-Chetham-Dogs-Bag-Isalbi-big-deal/