PRTN3 and anti-neutrophil cytoplasmic antibody-associated vasculitis: Univariate regression analysis was performed to evaluate possible correlations between AH on HRCT and AAV clinico-serological features, and a significant association was demonstrated with C-ANCA and the occurrence of AH (OR 4.80; 95% CI 1.29–17.91) (p = 0.020).