Atypical hyperplasia is an accumulation of abnormal cells in the breast and it is a risk factor for developing breast cancer. Atypical ductal hyperplasia is caused by the accumulation of abnormal cells that are similar to the breast duct cells. Atypical lobular hyperplasia is caused by abnormal cells similar to the breast lobule cells.
Types of Breast Cancer
There are many types of breast cancers, and correctly identifying each one is important to determine the proper treatment. Breast cancer can be classified by the stage of cancer at diagnosis, how the cancer cells look under the microscope (histology) and their biological characteristics (receptor status).