Croup syndrome usually affects the larynx, trachea, and bronchi, and this inflammation of the upper air way produce typical symptoms: inspiratory stridor, hoarseness, and a barklike cough. The most common form, acute laryngotracheobronchitis, is caused by viral infection. Croup syndrome is of great importance in infants and small children, because a rare form, acute epiglottitis, is a medical emergency often requiring immediate treatment with an artificial air way. We report two cases of Croup syndrome.