“…The presence of palpable enlarged axillary lymph nodes on the side of the tumour has only been reported in two primary breast OS cases (4,12). Similar to the radiology examinations of the current patient, in mammography imaging, OS presents as a well-circumscribed, oval and firm calcified mass (6–8,11–15). In USG imaging, the tumour may be observed with blurred outlines, heterogeneous echogenicity and focal calcification (8,11,14,15).…”