the incidence of occult lymphatic metastases in the no neck and the need for elective neck irradiation were least for cancers of the transglottis and central supraglottis ( 14-16 % ) , intermediate for cancers of the glossoepiglottis and the marginal supraglottis ( 20-38 % ) , and greatest for cancers of the pyriform sinus ( 47 % ) .
C0027530
neck
C0153400
cancers of the pyriform sinus