MedicalTerminology DB

Meaning of atypical ductal breast hyperplasia: A benign (not cancer) condition in which there are more cells than normal in the lining of breast ducts and the cells look abnormal under a microscope.

Definition of atypical ductal breast hyperplasia

A benign (not cancer) condition in which there are more cells than normal in the lining of breast ducts and the cells look abnormal under a microscope. Having atypical ductal breast hyperplasia increases the risk of breast cancer. Also called ADH and atypical ductal hyperplasia.

Written and maintained by James Murray Last updated July 21, 2026 Educational reference, not medical advice. Read the limitations.

For learning, not diagnosis. This glossary provides general educational information and is not a substitute for advice from a qualified healthcare professional. If you may be experiencing a medical emergency, contact local emergency services.