摘要Coronary stent fracture (SF) is a rare but potentially serious complication of coronary artery stenting.Here we report a case of acute myocardial infarction as a consequence of very late in-stent thrombosis due to multiple steut fractures at 8 sites and multiple stent malapposition formation four years after a sirolimus-eluting stent implantation (Firebird,Microport,Shanghai,China).A 43-year-old man with hyperlipidemia and a smoking history was referred for coronary angiography (CAG)following repeated exertion associated chest pain in January 2007.CAG revealed a diffused tortuous stenosis at the proximal segment and a total occlusion at the mid-segment of the left anterior descending (LAD) artery,a 90％ stenosis at the proximal segnent of the left circumflex artery (LCX),and a diffused lesion with a maximal 60％ stenosis of the right coronary artery (RCA).