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Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Between 10 and 40%, and in some series up to 70%, of patients develop coronary artery aneurysm or stenosis.

The prognosis depends on the diameter of the aneurysms; those less than 4 mm normally regress completely while larger ones tend to leave permanent sequelae. There are permanent sequelae in 5 to 10% of patients, including thrombosis, stenosis or rupture of the coronary arteries.

Myocarditis or myocardial infarction are the main causes of death.

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