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We present the case of a 5-year-old-boy who developed a fever and cellulitis-like groin rash 5 days before developing conjunctivitis and 6 to 7 days before other typical signs of Kawasaki disease (KD) appeared. The cellulitis failed to respond to antibiotics and no pathogens were isolated. His fever and clinical signs resolved with intravenous immunoglobulin and high-dose aspirin after discontinuation of antibiotics. Nonbacterial cellulitis is a rare presenting sign of KD, but in the appropriate clinical setting and population, a diagnosis of KD should be considered when cellulitis and fever fail to respond to an appropriate antibiotic regimen and no pathogen can be isolated.

Isolated left atrial appendage (LAA) ostial stenosis is a very rare entity found coincidentally in adults by transesophageal echocardiography. A 3-month-old healthy infant was suspected as having cor triatriatum. His brother had a history of surgical treatment of cor triatriatum. A cardiac catheterization revealed a narrowed ostium of the LAA and confirmed the echocardiographic diagnosis of isolated LAA ostial stenosis. This is the first pediatric case of idiopathic LAA ostial stenosis. The siblings called our attention to the differential diagnosis and the etiopathogenesis between LAA ostial stenosis and cor triatriatum.