What is the reported frequency of coronary artery aneurysms in Kawasaki disease among affected children?

• A. Up to 5%
• B. Up to 10%
• C. Up to 20%
• D. Up to 40%

Answer: (C)

Kawasaki disease can inflame and weaken the walls of the coronary arteries, leading to aneurysm formation if the disease is not treated. In untreated cases, about one in five affected children develop coronary artery aneurysms, roughly 20%. Timely treatment with intravenous immunoglobulin (IVIG) dramatically lowers this risk, bringing it down to only a few percent. So the figure of up to 20% reflects the untreated scenario, while treated cases have a much lower incidence.