[A Case of Retroperitoneal Primary Undifferentiated Pleomorphic Sarcoma with a Rapid Course]
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A 50-year-old woman presented to our hospital in May2021 with a fever of approximately39 °C and abdominal pain. A contrast-enhanced computed tomography (CT) scan revealed an 88 mm right renal tumor. Two weeks later, a follow-up CT scan demonstrated rapid tumo... ...
