Breast Atypical Hyperplasia

**Semantic type:** Neoplastic Process

**Definition:** A general term that refers to atypical hyperplastic proliferations of the epithelial cells in the breast parenchyma. Examples include atypical ductal hyperplasia, atypical lobular hyperplasia, and columnar cell hyperplasia with atypia.

**Synonyms:** - Atypical Breast Hyperplasia - Atypical Hyperplasia of Breast - Atypical Hyperplasia of the Breast