Acute Renal Failure and Generalized Weakness in a 75-Year-Old Male With Pauci-Immune Necrotizing Antineutrophil Cytoplasmic Antibody (ANCA)-Associated Vasculitis: A Case Report.

We describe a 75-year-old male who presented to the emergency department with generalized weakness and was ultimately diagnosed with acute renal failure secondary to pauci-immune necrotizing antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis. The patient's clinical course was complicated by a perforated gastric ulcer and severe malnutrition, necessitating involvement from multiple specialists. The case highlights the challenges of this rare vasculitis and the complications that can arise from the disease and its treatment. .