Abstract
We report our experience with a case of bilateral axillary accessory breasts and mammary pseudoangiomatous stromal hyperplasia (PASH). The present patient was a 45-year-old woman who presented with chief complaints of swelling and redness of both breasts as well as the left axilla. In addition to swelling of both breasts, a tumor was observed in the left axilla. Chest CT showed diffuse swelling of both mammary glands in addition to an approximately 10 cm-soft tissue tumor in the left axilla. The left axillary tumor was resected for diagnostic purposes. The patient was subsequently diagnosed with axillary accessory breasts and PASH, and underwent bilateral tolal mastectomy in addition to resection of the left and right axillary tumors due to further swelling of both mammary glands as well as development of tumors in both axillary regions. HE staining showed slit-shaped, vessel-like spaces in the mammary stroma. The inner surface of these spaces was covered by a layer of spindle-shaped cells, which tested positive for CD34 and negative for factor VII-related antigen on immunohistochemical staining. Based on these findings, the patient was diagnosed with bilateral axillary accessory breasts and mammary PASH. We report the present case with reference to literature.
