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A 48-year-old man with multiple myeloma and a history of a repaired umbilical hernia and four thromboembolic events was admitted for cramping abdominal pain associated with back pain and a weight loss of 5 kg (11 lb) during the previous month. Physical examination showed a distended abdomen and no lower-extremity edema. Laboratory evaluation was notable for a creatinine level of 1.2 mg per deciliter (108 µmol per liter), an albumin level of 3.3 g per deciliter, and normal urinary sediment. Contrast-enhanced computed tomography showed well-defined cystic retroperitoneal masses in which the kidneys appeared to be floating, extending from below the . . . [Full Text of this Article] |