Background To evaluate the importance of larynx compartments in prognosis T3-T4a laryngeal cancer treated with transoral laser microsurgery. Methods Two hundred and two consecutive pT3-T4a carcinomas. Pre-epiglottic space involvement, anterior posterior paraglottic (PGS) vocal cord, arytenoid mobility were determined. Local control (LC), overall survival (OS), disease-specific (DSS), laryngecto...