Pictorial Guide to Delineating the Recurrent Laryngeal Nerve as an Organ at Risk.

The recurrent laryngeal nerve (RLN) is especially vulnerable in cases of reirradiation, large-volume irradiation, or stereotactic body radiation therapy. Although RLN injury is rarely reported, it can cause hoarseness, swallowing difficulties, and airway obstruction, often with delayed onset. We aimed to map the course of bilateral RLNs on radiation therapy planning computed tomography scans to assess its feasibility as an organ at risk.