Usual ductal hyperplasia (UDH)

by Livia Florianova, MD FRCPC
March 13, 2022

What is usual ductal hyperplasia (UDH)?

Usual ductal hyperplasia (UDH) is a non-cancerous condition that develops in the ducts normally found in the breast. It is a very common condition in young women but can happen to women of all ages. UDH is often found after the tissue is removed from the breast for other reasons.

breast normal anatomy

How do pathologists make the diagnosis of usual ductal hyperplasia?

The diagnosis of UDH can be made after a small sample of tissue is removed from the breast in a procedure called a biopsy. UDH may also be seen in a larger piece of tissue removed to treat another condition.

What does usual ductal hyperplasia look like under the microscope?

When examined under the microscope your pathologist will see an increased number of epithelial cells which fill and expand some of the ducts. Other noncancerous changes such as cysts, calcifications, and apocrine metaplasia may also be seen in the tissue sample.

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