Pan-oral submous fibrosis is a chronic, progressive, scarring, high-risk precancerous condition seen primarily in southern laiwan where betel quid chewing is popular.

• 摘要全口黏膜下织维化是一种慢性,疤痕性,真高危险性的癌前病灶,常见于嗜嚼食槟榔的南台湾。