Anal sphincterotomy is a surgical procedure that involves treating mucosal fissures from the anal canal/sphincter.

Angioplasty, also known as balloon angioplasty and percutaneous transluminal angioplasty (PTA), is a minimally invasive, endovascular procedure to widen narrowed or obstructed arteries or veins, typically to treat arterial atherosclerosis.

Anterior temporal lobectomy is the complete removal of the anterior portion of the temporal lobe of the brain.

An appendectomy (known outside the United States as appendisectomy or appendicectomy) is the surgical removal of the vermiform appendix.

Arthroscopy (also called arthroscopic or keyhole surgery) is a minimally invasive surgical procedure on a joint in which an examination and sometimes treatment of damage is performed using an arthroscope, an endoscope that is inserted into the joint through a small incision.