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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Primary extraskeletal osteosarcoma of omentum majus | Tao et al. World Journal of Surgical Oncology 2011 9 25 http www.wjso.eom content 9 1 25 5 t WORLD JOURNAL OF SURGICAL ONCOLOGY CASE REPORT Open Access Primary extraskeletal osteosarcoma of omentum majus Shui-Xiang Tao1 Guo-Qin Tian2 Meng-Hua Ge3 Cheng-Long Fan4 Abstract Extraskeletal osteosarcoma is a rare malignant soft tissue tumor. Here we present a case of a primary extraskeletal osteosarcoma arising from omentum majus in a 40-year-old Chinese woman. Ultrasonography of the pelvic cavity showed a large soft tissue mass with marked calcification. Complete surgical resection of the primary tumor was performed and the histopathological diagnosis was extraskeletal osteosarcoma of omentum majus. She was followed up without adjuvant radiotherapy and chemotherapy and died from widespread intra-abdominal lung and liver metastases 7 months postoperatively. Background Extraskeletal osteosarcoma ESOS is a rare malignant mesenchymal neoplasm in soft tissues but not directly attached to the skeletal system. Fewer than 300 cases have been reported to date. Here we describe a case of a primary ESOS arising from omentum majus. To the best of our knowledge this is the second reported case in the English literature. Case history A 40-year-old woman was admitted to our hospital complaining of lower abdominal pain with nausea and vomiting for 4 days. She denied any history of other previous abdominal injuries or pain and had no other pertinent past medical history. The patient s general condition was good and no weight loss was observed. Ultrasonography of the pelvic cavity showed a soft tissue mass with marked calcification measuring 6.9 X 4.6 cm. Laboratory tests revealed an increase in the alkaline phosphatase 213 u L and carbohydrate antigen 125 102 u moL . For resection of the tumor en bloc mass excision with segmental omentum majus resection was performed. During the operation the mass was located in the lower margin of greater omentum and tumor invasion into surrounding .
