Irradiation of subclinical disease in the draining lymphatics.
D002294:Carcinoma, Squamous Cell / Q000532:radiotherapy; D003131:Combined Modality Therapy; D006119:Groin; D006258:Head and Neck Neoplasms / Q000532:radiotherapy / Q000601:surgery; D006801:Humans; D008197:Lymph Node Excision; D008198:Lymph Nodes / Q000528:radiation effects; D008207:Lymphatic Metastasis / Q000532:radiotherapy*; D011379:Prognosis; D011879:Radiotherapy Dosage; D013997:Time Factors