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Subglottic hemagioma is a rare cause of stridor, but it is one of the most common vascular neoplasms of the airways in childhood. If the treatment is not promptly instituted, it becomes a life-threatening condition. The diagnosis should be suspected when infants outside the age range for acute laryngitis present with stridor associated with severe respiratory effort, without viral prodromes, with a condition that is not responsive to initial therapeutic measures considering the main diagnostic hypothesis. Infantile hemangiomas begin to proliferate during the first year of life (between the 1st and 2nd month of life). Involution usually occurs between 6 months and 12 months of life (most involution until 4 years). The case is a 5-month-old female infant, with sudden stridor associated with respiratory distress without viral prodromes or fever, with little response to inhaled short-acting beta-agonist, inhaled adrenaline, as well as corticosteroids inhalation/parenteral. Bronchoscopy showed a bulging of the submucosa to the right of the subglottis with slight vascularization, suggestive of subglottic hemangioma. Treatment with propranolol was initiated orally with the aim of regressing the hemangioma and after clinical stability, the infant was discharged with outpatient follow-up.

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