A Case of Myxofibrosarcoma of the Elbow

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  • 肘窩に生じた粘液線維肉腫の 1 例
  • 症例 肘窩に生じた粘液線維肉腫の1例
  • ショウレイ ヒジカ ニ ショウジタ ネンエキ センイ ニクシュ ノ 1レイ

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An 81-year-old man presented with a 1-month history of a rapidly growing nodule on the bend of the right elbow. Physical examination revealed a red, shiny, and hemorrhagic multilocular nodule measuring 3 cm in diameter. Histopathologically, the tumor consisted of two types of lesions, i.e., mucinous and hypercellular. Tumor cells with polygonal cytoplasms and atypical nuclei proliferated with elongated vessels in the mid-dermis and subcutaneous tissues. In both lesions, the tumor cells were positive for vimentin, but negative for S100 and CD34. A diagnosis of high-grade myxofibrosarcoma was made. The tumor was totally resected and neither local recurrence nor distant metastasis has been noted. Based on the cell density and cellular pleomorphism, myxofibrosarcoma is classified into three types ; low,intermediate, and high grade. Metastasis to the lungs and lymph nodes commonly occurs with high-grade tumors.

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