Atypical Ductal Hyperplasia

ADH is usually diagnosed on a breast biopsy. It means having an increased number of cells lining the ducts where the cells look atypical (or unusual).

While ADH is not a cancer, an excisional biopsy is required (ie. it should be removed surgically). The reason is that up to 40% of the time when ADH is found on biopsy, there may be associated DCIS or invasive cancer.