Bone in the breast: A case report of a metaplastic breast cancer with osseous differentiation

Metaplastic breast carcinoma is an uncommon malignant tumor with various pathologic subtypes. Diagnosis is often challenging due to the wide spectrum of clinical and imaging presentations. Here, we present the case of a very rare subtype of metaplastic breast carcinoma—a mixed-type metaplastic breast cancer with osseous differentiation in a 55-year-old female patient. The clinical presentation, imaging-pathology diagnosis, and treatment options are reviewed. Knowing this rarely reported but aggressive breast cancer is very important for clinicians to establish a timely diagnosis for effective management.