Breast hamartomas. An important entity in mammary pathology.

1. Fifteen cases of a rather distinct entity of tumour-like lesion in the breast are presented. 2. They have a distinct mammographic appearance and can be easily shelled out at surgery, leaving symmetrical breasts. 3. They are well-circumscribed lumps of varying size with a smooth surface. 4. Microscopically they show normal or dysplastic glandular structures of lobules and ducts, without neoplastic features, within a prominent fibrous stroma. The lesions appear to be closely related to adenolipomas.