title: Renal pseudotumor due to a retained perirenal sponge: CT features.
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 sonographic 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.
authors.affiliation: Department of Radiology, University Hospitals K.U.Leuven, Belgium.
authors.forename: M
authors.initials: M
authors.lastname: Grieten
authors.forename: H
authors.initials: H
authors.lastname: Van Poppel
authors.forename: L
authors.initials: L
authors.lastname: Baert
authors.forename: A L
authors.initials: AL
authors.lastname: Baert
authors.forename: R
authors.initials: R
authors.lastname: Oyen
mesh_terms: D003937:Diagnosis, Differential; D005547:Foreign Bodies / Q000000981:diagnostic imaging*; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging*; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D009392:Nephrectomy; D015503:Surgical Sponges; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography