What is an overgrowth of cells lining the ducts called?

The term used to describe an overgrowth of cells lining the ducts is known as hyperplasia. This condition refers to an increase in the number of cells in a tissue or organ, which can lead to an enlargement of the affected area. In the context of mammography and breast tissue, hyperplasia often pertains to the proliferation of epithelial cells within the ducts of the breast. It is important to note that while hyperplasia can be benign, it can also be associated with an increased risk of developing breast cancer if certain characteristics are present.

In contrast, metaplasia refers to the reversible transformation of one differentiated cell type to another, often due to chronic irritation or inflammation, rather than an increase in cell number. Carcinoma indicates a malignant tumor originating from epithelial cells and signifies a diagnosed cancer, while adenoma refers specifically to a benign tumor derived from glandular tissue. Understanding these distinctions is crucial in the medical field, particularly in the interpretation of breast imaging and pathology.