Procedure: Left simple mastectomy. Gross: Specimen received in formalin weighing about 853 grams. A rounded bulbous mass measuring 14 x 12 x 10 cm is seen under the skin. Serial slicing shows a well-circumscribed fleshy lobulated pink mass. The consistency of the tumor is firm and no obvious areas of necrosis are seen. Microscopy: Uniform picture comprising proliferating ducts in fibrocollagenous connective tissue stroma. There is prominent epithelial proliferation, but the stroma is less cellular and no cytological atypia or necrosis is seen.
Diagnosis: Giant fibroadenoma. No malignancy is seen.