Huge Bilateral Breast Hamartoma Accompanied with Pseudoangiomatous Stromal Hyperplasia

ABSTRACT

A 34-year-old woman presented with sudden breast enlargement that had occurred within 6 months. She also had an accessory breast mass on the left axilla. Clinical impression was phyllodes tumor. Needle biopsy revealed fibroepithelial tumor, a mixture of fibrous stroma and pseudoangiomatous stromal hyperplasia. The final pathologic report was hamartoma associated with focal pseudoangiomatous stromal hyperplasia and macromastia. This is the first reported case of bilateral breast hamartoma with hamartoma in ectopic breast tissue. The masses on the right and left breasts weighed 1,980 g and 1,233 g, respectively, while the mass on the left axilla weighed 36 g.