Primary extra osseous osteogenic sarcoma is one of the rarest forms of malignant tumor of the breast. It can arise as a result of osseous metaplasia of a preexisting neoplasm or from a none-phylloides sarcoma of a previously normal breast. Due to its rarity. the natural history and optimal treatment methods remain unclear. https://www.markymarkscott.com/product-category/5-17-5bgr/