When bacteria invade, the immune system will fight the infection and cause inflammation at the site of infection, a cavity is created, filled with pus to form an abscess. Abscess sites such as the abdomen or fluid collection in the chest need to be drained out of the body under the guidance of digital subtraction angiography.

Peripheral artery disease (PAD) is a disease of the arteries that occurs outside the heart or brain. In PAD, the arteries become narrowed or blocked. It is usually caused by atherosclerosis or plaque buildup. It often affects the arteries in the legs. Common methods for evaluating peripheral artery disease include vascular ultrasound, Doppler ultrasound, catheter angiography, computed tomography angiography (CTA), and magnetic resonance angiography (MRA).