... stage of primary) Subsite Percentage of metastases reported in prophylactically treated necksOral cavity68,86, 144 , 145 ,153,15 9-1 67>20%Glottic68, 146 0-1 5%Supraglottic 14 7-1 49 ,151,15 4- 1 57 8-3 0%Oropharyngeal68,15 0-1 52>50%Hypopharyngeal68,15 0-1 52>50%The ... may be less than 10%.1 54, 155 ,40 3 The incidence of occult positive nodes at level I and V is low, especially if other nodal levels are uninvolved.151,1 54, 155,158,1 84, 40 4- 4 06AsmallRCTreportednodifferenceinlocoregionalcontrolordisease-specicsurvivalfollowingeitheraselective(lateral)ormodiedradicalneckdissectioninpatientswithclinicallyN0supraglottic ... CANCER38 DIAGNOSIS AND MANAGEMENT OF HEAD AND NECK CANCER3 4 331++3 4 Prophylactic treatment of the neck is necessary in patients with clinically N0 neck because of the high incidence of occult...