Presentation
On almost all occasions the patients present with a palpable lump; in addition, they usually present as a slowly growing painless lump(2,3,4) even about six years (11), it has reported as a rapidly enlarging mass (12). Regarding the size, it can be as large as 30 cm (2) or 12 cm (3) but the average of their size is around 5.5(3).
Sites of origin: before labeling them as a primary mammary gland tumor, other neighbor’s origins should be ruled out such as underlying ribs, sternum, and even the pectoralis muscle which has been reported by Orta et al (13). It is worth mentioning that there is always a possibility for breast osteosarcoma to be a metastasis from primary bone osteosarcoma (14,15).