<prompt> All of the following are indication for adjuvant radiotherapy in head neck cancers except:-Multiple lymph node diseaseExtranodal involvementLymphovascular invasionLymph node 3cm  <response>: Lymph node 3cm is not an indication for adjuvant radiotherapy in head neck cancers. Indications for postoperative include:- -positive margins -invasion of the soft tissues of the neck -extranodal involvement - perineural invasion, and -more than 5 mm of subglottic invasion. 