WCN26-2092 ANCA-ASSOCIATED VASCULITIS PRESENTING PREDOMINANTLY AS TUBULOINTERSTITIAL NEPHRITIS WITHOUT URINARY ABNORMALITIES

Anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) typically presents as pauci-immune necrotizing crescentic glomerulonephritis with hematuria and proteinuria. Tubulointerstitial inflammation is usually secondary to glomerular injury. Cases where tubulointerstitial nephritis (TIN) predominates despite minimal glomerular involvement and absence of urinary abnormalities are extremely rare. Such presentations may delay diagnosis and accelerate renal dysfunction. We report a TIN-dominant case of AAV without urinary abnormalities.