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Primary Retroperitoneal Myxofibrosarcoma: A Case Report and Review of the Literature
並列摘要
Myxofibrosarcoma is a neoplasm of fibroblastic origin. It commonly occurs in the extremities in the elderly, but rarely arises in the trunk, especially in the retroperitoneum. Herein, we report a rare case and the imaging findings of a primary retroperitoneal myxofibrosarcoma in a 69-year-old male patient without any significant past history who had complained of intermittent abdominal pain and constipation for two months. The imaging studies, including ultrasonography, X-ray of the kidneys, ureter, and bladder (KUB), abdominal computed tomography (CT), and 3.0-Tesla magnetic resonance imaging (MRI), revealed a large well-circumscribed mass lesion arising from the left side of the retroperitoneum. The lesion was filled with great amount of homogenous fluid-like component without prominent calcification or a fat component. After surgical excision, a diagnosis of retroperitoneal myxofibrosarcoma was made. On the follow-up CT obtained ten months after surgery, a local recurrent tumor was observed. Although myxofibrosarcomas rarely arise from the retroperitoneum, the possibility of these tumors should be kept in mind in those patients who have a retroperitoneal lesion with imaging findings similar to that of the tumor.
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