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Spontaneous coronary artery dissection: Acute findings on coronary computed tomography angiography.

BACKGROUND: The coronary computed tomography angiography features of acute spontaneous coronary artery dissection, an important cause of acute coronary syndrome in young women, have not been assessed.

METHODS: The "Virtual" Multicenter Mayo Clinic Spontaneous Coronary Artery Dissection Registry was established in 2010 and includes retrospective and prospective patient data. Retrospective assessment of acute coronary computed tomography angiography images was performed for 14 patients (16 vessels) who had images performed within two days of invasive coronary angiography diagnosis of acute spontaneous coronary artery dissection.

RESULTS: Four pertinent diagnostic coronary features of acute spontaneous coronary artery dissection were observed in order of prevalence: 1) abrupt luminal stenosis (64%); 2) intramural hematoma (50%); 3) tapered luminal stenosis (36%); and 4) dissection (14%). Additional findings include epicardial fat stranding (42%), coronary tortuosity (29%), and coronary bridge (14%). Fifty percent of patients had myocardial hypoperfusion in the myocardial distribution of the dissected coronary artery.

CONCLUSIONS: We define key coronary computed tomography angiography features of acute spontaneous coronary artery dissection, the most common of which are abrupt luminal stenosis and intramural hematoma. Importantly, intramural hematoma appears similar to noncalcified atherosclerotic plaque, emphasizing the importance of invasive coronary angiography for acute diagnosis of spontaneous coronary artery dissection until the sensitivity and specificity of coronary computed tomography angiography is better understood.

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