Myocardial Infarction Caused by Accelerated Plaque Formation Related to Myocardial Bridge in a Young Man.

A 28-year-old man without coronary risk factors was admitted to the hospital with acute coronary syndromes (ACS). The angiogram and intravascular ultrasound revealed myocardial bridge (MB) in the mid-left anterior descending artery and flow-limiting plaque located 15.4 mm proximal to MB. The culprit lesion was treated only with drug-coated balloon, considering the patient's extremely young age. This case suggests that an accelerated formation of plaque caused by MB appeared to contribute to the development of ACS; thus, MB should be considered as an important cause of ACS in young patients with low cardiovascular risk.