The rate of invasion to paraglottic space(PGS) was 82%(41/50).Submucosal invasion was seen in 52%(26/50) and that with superficial mucosal invasion was seen in 38%(19/50).

• 浸润方式中，粘膜下深层浸润占52%25(26/50)，粘膜下深层浸润伴粘膜表面浸润占38%25(19/50)，沿粘膜表面浸润占10%25(5/50)。