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Unlabelled: Renal involvement is observed in 30% of sarcoidosis cases, but the exact occurrence is unknown, and the current numbers are estimated to be underestimated. The most common manifestation of renal sarcoidosis is interstitial nephritis, but other presentations are also possible, with specific histopathological and laboratory findings. Glomerulopathies, nephrocalcinosis and nephrolithiasis are among the most commonly seen types of renal involvement.
Case Reports: We would like to show a case series describing four patients with varying renal manifestations of sarcoidosis: membranous nephropathy, granulomatous interstitial nephritis, IgA nephropathy and chronic kidney disease. The diagnosis of sarcoidosis can precede, present simultaneously with or follow the onset of renal manifestations. Our patients also showcase varying clinical pictures of renal sarcoidosis with different changes in renal parameters.
Conclusions: The involvement of kidneys in sarcoidosis is multifaceted and may pose a diagnostic difficulty, and a diagnostic kidney biopsy is often needed. Chronic sarcoidosis patients should undergo regular screening for renal involvement to introduce proper management quickly and effectively.
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