This is Episode 15B: Subsite-Specific Coverage for Oral Cavity Cancer. You’re sitting at the contouring workstation with a post-operative oral cavity case loaded. The C-T simulation is fused with the best available preoperative imaging. The surgeon has sent you the operative report. And now you face the questions that define whether your plan is correct:Which nodal levels need coverage? Ipsilateral neck only or bilateral? How far do I extend my primary C-T-V? And what anatomic “must-include” structures are unique to this subsite? The oral cavity is not one disease. It’s a family of subsites with different drainage, different paths of spread, and different ways you get burned if you treat them all the same. Today we build subsite-specific contouring templates. You’ll learn which subsites have a low threshold for bilateral coverage, which can be treated ipsilaterally when truly well-lateralized, and what local extension pathways you must respect—every single time.