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Table 3 Classification of coronary artery abnormalities in the acute phase of Kawasaki disease and severity classification

From: Kawasaki disease: guidelines of Italian Society of Pediatrics, part II - treatment of resistant forms and cardiovascular complications, follow-up, lifestyle and prevention of cardiovascular risks

No coronary artery involvement: z-score < 2
Dilation of the coronary artery: z-score > 2 to < 2.5 SD
Small aneurysm of the coronary artery: z-score ≥ 2.5 to < 5 SD
Medium aneurysm of the coronary artery: z-score ≥ 5 to < 10 SD
Giant aneurysm of the coronary artery: z-score ≥ 10 SD