1 Inflammation of a child’s blood vessels (vasculitis), especially their coronary arteries. 2  The coronary arteries supply the heart with blood. 3  Inflammation can lead to enlargement of these arteries called aneurysms.4  Then a scar can form, narrowing the arteries.awasaki disease can also cause problems with the heart, including: 1  Inflammation of a child’s blood vessels (vasculitis), especially their coronary arteries. 2  The coronary arteries supply the heart with blood. 3  Inflammation can lead to enlargement of these arteries called aneurysms.