Final answer:
Mild and moderate dysplasia are considered low-grade, while severe dysplasia and carcinoma in situ are high-grade. Carcinoma in situ is a pre-malignant condition that is yet to invade neighboring tissues.
Step-by-step explanation:
In the context of epithelial tissue, there are several stages of dysplasia that are categorized based on their level of severity. Dysplasia is an abnormal growth or development of cells and can be indicative of a pre-cancerous condition. The levels of epithelial dysplasia and their classification into low-grade versus high-grade are as follows:
- Mild dysplasia is considered low-grade.
- Moderate dysplasia is also considered low-grade.
- Severe dysplasia and carcinoma in situ are considered high-grade.
Carcinoma in situ is a term used to describe a pre-malignant or pre-cancerous state where the abnormal cells are confined to the epithelium and have not yet invaded neighboring tissues.