Abstract

Mammary myofibroblastoma is a rare benign stromal tumour, predominantly occurring in menopausal women and older men. We present a case of a 73-year-old man with a tender right breast lump. He underwent a core biopsy assessment followed by a wide local excision. The lesion was a well circumscribed spindle cell nodule with interlacing fascicles and intervening collagen. The cells are elongate with pale cytoplasm and regular nuclei. There are scattered cells showing mild pleomorphism. Mitoses are uncommon. Multiple immunohistochemical stains were performed which were the key to diagnosis of myofibroblastoma. Completely excised lesions are not known to recur.

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