Kawasaki disease, also known as mucocutaneous lymph node syndrome, is a systemic vasculitis that causes inflammation in medium-sized arteries, particularly the coronary arteries. This inflammation can lead to dilation (aneurysm) or bulging in the walls of the affected arteries and can impact the heart muscle. It is a disease of early childhood, with approximately 85% of cases occurring in children under 5 years of age. Its main symptoms include high fever, inflammation of the mucous membranes in the mouth and throat, a reddish skin rash, and swollen lymph nodes.