Oral submucous fibrosis (OSF) is characterized by an abnormal accumulation of ollagenfibers in oral submucosa and is also regarded as a precancerous lesion.

• 摘要口腔粘膜下纤维性病变是一种发生在口腔粘膜的慢性疾病，其主要特徵为口腔粘膜下胶原纤维异堆积及表皮萎缩。