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Fig. 1A —75-year-old woman with palpable abnormality in upper right
breast. Mammograms revealed 4 x 2 cm circumscribed, virtually completely
calcified ovoid mass at 10-o'clock position in right breast. Although mass was
largely circumscribed, calcifications took irregular form at medial and
lateral margins of mass (arrows). At 12-o'clock region, smaller mass
lesion with irregular, microlobulated margins and associated architectural
distortion is seen (thin arrow) in background of nodular breast
tissue. Incisional biopsy of larger mass revealed metaplastic carcinoma with
osteochondrosarcomatous differentiation.
