Myoepithelioma of the Breast
Definition
- Bland spindle cell lesion of the breast with a myoepithelial cell phenotype
Diagnostic Criteria
- Monomorphic cytologically bland spindle cells
- Elongate nuclei
- No pleomorphism
- No mitotic figures
- Clear to eosinophilic cytoplasm
- Interlacing groups of cells, may be stellate or solid masses
- May infiltrate fat
- May surround normal ducts
- Myoepithelial phenotype
Richard L Kempson MD
Robert V Rouse MD
Department of Pathology
Stanford University School of Medicine
Stanford CA 94305-5342
Original posting:: May 27, 2006