Mammogram and x-ray of surgical specimen of an extraosseous osteosarcoma arising in the breast

(A) The mammogram of the left breast reveals a 2 cm mass with dense calcifications (arrow).
(B) X-ray of the surgical specimen showing a densely calcified mass with the needle localizer traversing the mass. The x-ray confirms the heavy calcification, and histopathology confirmed the diagnosis of an extraosseous osteosarcoma.