How many types of precancerous lesions are there for laryngeal cancer?

Precancerous lesions of laryngeal cancer include the following:

1. Laryngeal keratosis This disease includes leukoplakia and laryngeal pachyderma. The former is more common and some may develop into cancer. Laryngeal keratosis can occur in various parts of the larynx, but it is most common in the vocal cords.

2. Papilloma Papilloma can be divided into juvenile and adult types. Juvenile type is usually believed to be related to viral infection, often multiple and prone to recurrence. Adult type is more likely to become cancerous, with a canceration rate of 11.5%-28.1%.

3. Chronic hyperplastic laryngitis is often manifested as irregular hyperplasia of the epithelium, and the subepithelial layer often has extensive chronic inflammatory cell infiltration. For elderly people with a long history of smoking, if local irregular changes in the laryngeal mucosa occur, such as ridges, rough mucosa or shallow ulcers, it is necessary to conduct a laryngeal examination.