Atypical hyperplasia

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Atypical hyperplasia is a benign (noncancerous) cellular hyperplasia in which cells show some atypia. In this condition, cells look abnormal under a microscope and are increased in number.

By organs[edit]

Breast[edit]

Atypical hyperplasia is a high-risk premalignant lesion of the breast. It is believed that atypical ductal hyperplasia (ADH) is a direct precursor for low-grade mammary ductal carcinoma, whereas atypical lobular hyperplasia (ALH) serves as a risk indicator.

External links[edit]

 This article incorporates public domain material from the U.S. National Cancer Institute document "Dictionary of Cancer Terms".