title: Renal Sarcoidosis Mimicking Xanthogranulomatous Pyelonephritis.
abstract: A 70-year-old male patient underwent left-sided nephrectomy for signs and symptoms that were suggestive of xanthogranulomatous pyelonephritis (recurrent fever, swollen malfunctioning kidney, granulomatous inflammation in renal biopsy). Contralateral progression and workup for further symptoms finally established the diagnosis of extrapulmonary sarcoidosis. With corticosteroid and azathioprine treatment, renal function was preserved in the long term. Awareness of similarities in computed tomography imaging and histopathological findings of xanthogranulomatous pyelonephritis and renal sarcoidosis may prevent delayed diagnosis and inappropriate treatment of the latter.
authors: Department of Urology, University Hospital "Carl Gustav Carus", Technische Universität Dresden, Dresden, Germany. Electronic address: michael.froehner@uniklinikum-dresden.de.
authors: Michael
authors: M
authors: Froehner
authors: Department of Pathology, University Hospital "Carl Gustav Carus", Technische Universität Dresden, Dresden, Germany.
authors: Matthias
authors: M
authors: Meinhardt
authors: Department of Nephrology, University Hospital "Carl Gustav Carus", Technische Universität Dresden, Dresden, Germany.
authors: Simon
authors: S
authors: Parmentier
authors: Department of Nephrology, University Hospital "Carl Gustav Carus", Technische Universität Dresden, Dresden, Germany.
authors: Christian
authors: C
authors: Hugo
authors: Department of Urology, University Hospital "Carl Gustav Carus", Technische Universität Dresden, Dresden, Germany.
authors: Manfred P
authors: MP
authors: Wirth
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D007674:Kidney Diseases / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D008853:Microscopy; D011705:Pyelonephritis, Xanthogranulomatous / Q000000981:diagnostic imaging*; D012507:Sarcoidosis / Q000000981:diagnostic imaging* / Q000473:pathology; D014057:Tomography, X-Ray Computed