TY - JOUR T1 - A Case Report of Osteosarcoma of the Mandible as Peripheral Tumor Like Lesion TT - گزارش یک مورد اوستئوسارکومای مندیبل به صورت یک ضایعه شبه تومورال محیطی JF - umsha JO - umsha VL - 21 IS - 1 UR - http://sjh.umsha.ac.ir/article-1-109-en.html Y1 - 2014 SP - 80 EP - 84 KW - Mandible KW - Osteosarcoma N2 - Introduction: Osteosarcoma (OS) is primary malignant bone tumor in which mesenchymal cell produce osteoid. OS of jawbones is uncommon, representing 4-8% of all OS. Case Report: This paper reports the case of a- 29 year-old female with an OS in mandibular first molar as exophitic lesion with smooth surface during 1 year. Based on the patient's symptoms, differential diagnosis was lymphoma and malignant meshenshymal tumors. Exci-sional biopsy was done and histopatholigic feature proved to be OS. Conclusion: Postoperatively, the patient was referred to the oncology department of Tehran Imam Khomeini hospital for further evaluation and treatment. M3 ER -