title: Benign smooth muscle cell metaplasia in breast.
abstract: Three different benign breast lesions showing smooth muscle cells in the stroma are reported. Benign smooth muscle cells are rarely found in the breast, and it is likely that they originate from metaplastic changes of the stroma itself.
mesh_terms: D000232:Adenofibroma / Q000473:pathology* / Q000648:ultrastructure; D000328:Adult; D001940:Breast / Q000473:pathology* / Q000648:ultrastructure; D001943:Breast Neoplasms / Q000473:pathology* / Q000648:ultrastructure; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008679:Metaplasia / Q000473:pathology; D008854:Microscopy, Electron; D008875:Middle Aged; D009130:Muscle, Smooth / Q000473:pathology / Q000648:ultrastructure