Abstract: Soft tissue osteosarcoma are extremely malignant neoplasms.Few large series have been reported.Theis study was performed with a relatively large mumber of patients to better understand the biologic behaviornd clinicopathologic correlations.The study group cosisted of 21 patients. Most of whom Presemted in the fifth and sixth decades of life(mean age,49.5 yeaxs).There was a female predominace(male to female ratio,1:2). The mammae and chest most commonly were involved(48%),Histologically,all were high grade ostoosarcoma,Multiple local recurrences(52%)are a featare of this tumor.All recurrences occurred with 6 month.Distant metastasis(43%)is also common and is usually to the lungs(67%),A larger sized inital lesion did eguate with worse result.