Over the last three episodes, we have constructed the entire modern framework for rectal cancer management. We’ve established when to treat, how to treat, and who to treat with advanced strategies like TNT and immunotherapy. Today, we bring it all to the treatment planning console.This is the practical application episode. We will provide a step-by-step guide to modern rectal cancer contouring based on international consensus. We'll review critical dose constraints you must know. And finally, we will tackle one of the most complex scenarios in our field—using a case to outline a safe and effective approach to pelvic re-irradiation.