sentences:  Vessel dissection was a frequent issue as a result of improper sizing of the balloon relative to the arterial diameter.Late restenosis occurred in as many as 30% of individuals who underwent PTCA, often causing recurrence of symptoms necessitating repeat procedures.From the time of the initial percutaneous balloon angioplasty, it was theorized that devices could be placed inside the arteries as scaffolds to keep them open after a successful balloon angioplasty.