Transient radiation-induced severe obstructive sleep apnea.

Radiotherapy for head and neck cancer can trigger or worsen obstructive sleep apnea (OSA) due to factors such as neurological impairment, muscle atrophy, edema, and xerostomia. We present a case in which a patient developed severe OSA three months after undergoing radiochemotherapy and neck dissection for squamous cell carcinoma of the right lingual tonsil with regional metastasis. Polysomnography confirmed severe OSA.