RT Journal Article SR Electronic T1 An unusual cause of congenital stridor JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 3520 DO 10.1183/13993003.congress-2020.3520 VO 56 IS suppl 64 A1 Wiemers, Anna A1 Schramm, Dirk A1 Amrhein, Peter YR 2020 UL https://publications.ersnet.org//content/56/suppl_64/3520.abstract AB Congenital stridor is often a reason for a medical consultation. In most cases laryngomalacia is the cause for the upper airway obstruction. In the absence of other symptoms/complications such as episodes of apnea or failure to thrive there is mostly no need for further investigation.We present the case of a 5 week-old female infant who was admitted to our clinic due to congenital stridor. Stridor was persistent since birth and she was diagnosed with tracheomalacia by her physician.Shortly before being admitted to our clinic she had developed a mild infection of the upper airway. Due to an episode of cyanosis she was admitted to another hospital and monitored for 3 days. Since she showed no further pathologies she was discharged home without further intervention.Due to the history of the cyanosis, the noisy stridor and her parent’s wish for further diagnostics we performed a flexible endoscopy in spontaneous ventilation under sedation with propofol. The endoscopy showed a white mass laryngopharyngeal with black hair on the surface, almost obstructing the entire airway. The further endoscopy of the airways was normal.With suspected teratoma of the laryngopharynx our patient was converted to an ent-clinic where the tumor was removed in toto without further complications. She was discharged home few days later and has been without symptoms since.A histopathological examination of the tumor showed it was a "hairy polyp".Conclusion: In cases of congenital stridor with additional symptoms/complications i.e. episodes of apnea, cyanosis, failure to thrive or dysphagia further diagnostic steps such an airway endoscopy are indicated.FootnotesCite this article as: European Respiratory Journal 2020; 56: Suppl. 64, 3520.This abstract was presented at the 2020 ERS International Congress, in session “Respiratory viruses in the "pre COVID-19" era”.This is an ERS International Congress abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only).