Kawasaki disease is an acute systemic vascular disease, generally self-limited and typically affecting children <5 years old, which leads to coronary artery aneurysms in about 25% of untreated cases. Cardiovascular involvement is characterised by transient pancarditis, in acute phase, while coronary illness, ranging from mild dilation to giant CAAs occurs late, rarely before the 10th day since fever onset. Here, we describe a peculiar case of KD, which occurred in a 4-month-old infant and presented with exudate cardiac tamponade and early giant aneurism of both the proximal right coronary artery) and the left circumflex coronary artery, in acute phase of the disease.