ESR1 and Venous thrombosis: According to univariate analysis, factors significantly associated with the complication of aneurysmal lesions in BD patients include pathergy reaction (P < 0.001), arterial stenosis or occlusion (P < 0.001), arterial thrombosis (P = 0.002), venous involvement (P = 0.001), venous thrombosis (P = 0.028), elevated ESR levels (P < 0.001), and elevated CRP levels (P < 0.001).