Renal Pseudotumor due to a Retained Perirenal Sponge

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Abstract
A case of a surgically retained, encapsulated sponge presenting as an unusual cause of renal pseudotumor is described in a man who had a partial nephrectomy for renal cell carcinoma 1 year before. The nonspecific sono-graphic appearance of a hyperechoic renal mass and the atypical CT features of a thick-walled indeterminate mass suggested a hematoma, a hemorrhagic cyst, or a hemorrhagic neoplasm. A retained surgical sponge within a thick fibrotic capsule adhesive to the renal capsule was found at surgery.

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