Bronchial artery-pulmonary artery fistula: manifested as thickening and tortuosity of the bronchial artery on the side of the lesion, and disorganized vessels in the lesion area. Drainage vessels converge into one or several branches of the pulmonary artery, with the increase in pressure of the injected contrast medium, gradually extending the direction of the pulmonary portal to develop, but because the blood flow of the pulmonary artery is centrifugal, so in the low-pressure injection in the direction of the pulmonary portal flow of the contrast medium will soon turn to the direction of centrifugal, washed out by the flow of blood, dilution. The right atrium can only be visualized when the injection pressure is high or the fractional flow is large. Bronchial artery-pulmonary vein fistula: the distinctive feature is that the drainage vessel is a branch of the pulmonary vein, and the contrast agent is diverted into the left atrium via the pulmonary vein, and enters the left ventricle and the circulation. Intercostal artery-pulmonary arteriovenous fistula: most of the cases in this group coexist with bronchial artery-pulmonary arteriovenous fistula, which is a special manifestation of BPS.