口腔黏膜下纤维化症是口腔癌前病变的另一种,成因几乎全为嚼槟榔引起,病灶常见于颊黏膜、其次是腭部和臼齿后区,患部黏膜首先失去正常的浅红色、变白,接着反覆出现溃疡或水泡,最后黏膜会慢慢失去弹性,用手指触压可明显感受黏膜有如皮革,甚至摸到纵走方向的“纤维化带”,此纤维化带会拉住嘴角与颊黏膜,造成无法张大口,严重影响日常口腔功能,如进食、刷牙或牙齿之检查、治疗等。
病灶如果发生在口咽之间的软腭部位,可导致吞咽困难;悬雍垂也会因而萎缩或变形,用手刺激时不会有呕吐反射。临床伴随口内烧灼感、刺痛、干涩的感觉,对辛辣、热等食物极度敏感,味觉却显麻木。
病程进行到后段,可能并发喉痛、耳痛、失聪,到发展成口腔癌,则有较高的死亡率。目前治疗方式有:注射类固醇或全身性用药减少纤维化物质;手术或雷射摘除纤维化带,不过疗效有限,且多因体质而异,用药也可能有不少副作用,最好还是预防胜于治疗,拒吃槟榔即可完全预防此症。
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