Only when esophagus or thyroid involved? Or also when subglottis and hypopharynx involved?
How do you define the CTV border? Some commonly stated boundaries:
Superior: Suprasternal notch (AJCC; NCCN)
Inferior: Innominate (NCCN H&N section) but carina (NCCN thyroid section)
Anterior: Sternum (NCCN; AJCC)
Posterior: Trachea/esophagus (NCCN; AJCC)