Despite its low incidence—increasing from 3 cases per 100,000 people in 2013 to three 3 per 45,000 currently—UPS demonstrates a worrying trend towards a gradual increase in occurrence [ 6 , 9 ].
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A Detailed Examination of Retroperitoneal Undifferentiated Pleomorphic Sarcoma: A Case Report and Review of the Existing Literature.
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