Atypical ductal hyperplasia (ADH) is an abnormal production of
cells within the duct system of the breast. Women who have atypical ductal
hyperplasia have an increased risk of breast cancer.
Atypical ductal hyperplasia is usually discovered by mammography
and diagnosed with a biopsy of the breast. Women who have ADH are usually
followed closely by a doctor and have a breast exam every 6 months
and a mammogram once a year.