Myxoid liposarcoma metastatic to the mandible: First case report and review of the literature

Unlike other soft tissue sarcomas, myxoid liposarcoma tends to metastasize to bone even before developing lung metastases. In this report, we present a unique case of myxoid liposarcoma metastatic to the mandible. A 40-yearold male who had a history of myxoid liposarcoma in the buttock presented with paresthesia in the left lower face and mandible. Radiographic examination revealed an ill-defined radiolucent lesion with cortical destruction in the left mandibular body and ramus. Histopathological examination showed a mixture of small lipoblasts and round primitive mesenchymal cells in a myxoid stroma. Hypercellular areas comprising high-grade round cells were frequently found. The final diagnosis of metastatic myxoid liposarcoma was made. Despite postoperative chemoradiotherapy, further metastases occurred in the lungs and liver, and the patient died of the tumor 23 months after the treatment of the mandibular lesion. This is the first report of myxoid liposarcoma metastatic to the jaw, which may help in the differential diagnosis of intraosseous myxoid tumors of the jaws and highlights unfavorable clinical outcome of metastatic high-grade myxoid liposarcoma.