18F-FDG PET/CT Imaging of Necrotizing Crescentic Glomerulonephritis With Anti–Glomerular Basement Membrane Disease

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A 30-year-old woman presented with lethargy, night sweats, and fever with raised inflammatory markers. Anti–neutrophil cytoplasmic antibody was negative. Abdominopelvic CT was unremarkable. Subsequently, she underwent FDG PET/CT showing globally enlarged kidneys with diffuse hypermetabolic activity within the renal parenchyma bilaterally. Renal biopsies showed morphologic features of an active necrotizing crescentic glomerulonephritis, which was confirmed clinically and treated. This case demonstrates the role that FDG PET/CT can play in inflammatory conditions, such as glomerulonephritis, where it may be clinically useful when the presentation is atypical.

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