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  • Title: Renal sarcoidosis with limited lung manifestations expressing Propionibacterium acnes antigens in the affected tubulointerstitium.
    Author: Satoh F, Morita H, Tayama H, Inoue Y, Eishi Y, Yoshimura A.
    Journal: Am J Med Sci; 2013 Sep; 346(3):250-2. PubMed ID: 23531993.
    Abstract:
    Sarcoidosis is a granulomatous multisystemic disorder of unknown origin that can affect the kidneys. Previous reports from Japan and Europe have indicated a link between Propionibacterium acnes infections and sarcoidosis. Here, we present the case of a 68-year-old woman with hypercalcemia and renal failure. A kidney biopsy was performed, which showed granulomatous tubulointerstitial nephritis with a large nonnecrotic nodule that contained mononuclear inflammatory cells and multinucleated giant cells. Subsequent immunohistochemical analysis revealed intracytoplasmic structures, which strongly indicated the presence of the P acnes antigen. Treatment with methylprednisolone ameliorated the patient's hypercalcemia and renal failure. This case report emphasizes the potential of chronic P acnes infection to cause sarcoidosis.
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