Small Glandular Proliferations of the Breast

This article discusses the most common small glandular proliferations, namely sclerosing lesions (sclerosing adenosis and radial scar), tubular carcinoma, and epithelial displacement after needle core biopsy, as well as less common entities, such as low-grade adenosquamous carcinoma, microglandular adenosis, and syringomatous adenoma. Due to significant morphologic overlap, these entities are easily mistaken for one another. The similarities and differences among these lesions in their clinicopathologic features, radiologic findings, and immunohistochemical profiles are emphasizesd.