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Coronary angiogram of a patient with stenosis of the right coronary artery showing repair using balloon angioplasty, a procedure in which a long, thin tube with a deflated balloon at the tip (a balloon-tipped catheter) is advanced into the blocked coronary artery. When the  catheter is within the narrowed segment of the artery, the balloon is rapidly inflated, pushing the plaque in the artery back against the wall of the artery. A wire mesh tube or stent is then permanently implanted to hold the artery open. The area of blockage is on the left center and the coronary artery was visualized with a bolus of contrast material released from the catheter.