“…The etiology of BAA remains unclarified, but previous literature indicated associations with increased bronchial artery blood flow and weakening or injury of the vessel walls. 8 Diseases relevant to multiple BAAs are bronchiectasis, 14,15 hypertension, 7,10,19 atherosclerosis, 10 interstitial lung disease, 15 mycobacteria infection, 17 and scleroderma. 17 Congenital malformation was also considered a cause of BAA.…”