{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,4,25]],"date-time":"2025-04-25T15:10:03Z","timestamp":1745593803897,"version":"3.40.4"},"reference-count":15,"publisher":"BMJ","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["BMJ Case Reports"],"published-print":{"date-parts":[[2009]]},"abstract":"<jats:p>Congenital high airway obstruction syndrome (CHAOS) is a rare but life-threatening condition that results from the obstruction of the upper airways.<\/jats:p><jats:p>We describe a female newborn, from a Gr\u00e1vida II, Para 0, 36-year-old woman, with a routine ultrasound at 30 weeks\u2019 gestation that showed polyhydramnios. She delivered a live-born female baby at 36 weeks without any dismorphic features but with respiratory distress. Attempts at endotracheal intubation were unsuccessful due to the presence of a mass obstructing the larynx. The reanimation process was stopped after 20 minutes. Post-mortem examination demonstrated the presence of a total occlusion of the larynx by a laryngomucocoele. Laryngocele, a congenital cyst of the larynx, occurs rarely and hardly ever as a cause of CHAOS. What is more, laryngomucocoele has not been previously reported as a cause of CHAOS. These conditions represent a neonatal emergency with reserved prognosis unless diagnosed antenatally allowing for a programmed ex utero intrapartum treatment (EXIT) by performing tracheostomy while maintaining the placental circulation.<\/jats:p>","DOI":"10.1136\/bcr.07.2008.0595","type":"journal-article","created":{"date-parts":[[2009,2,27]],"date-time":"2009-02-27T18:12:46Z","timestamp":1235758366000},"page":"bcr0720080595","source":"Crossref","is-referenced-by-count":1,"title":["Congenital laryngomucocoele: a rare cause for CHAOS"],"prefix":"10.1136","volume":"2009","author":[{"given":"Manuel Sousa","family":"Cunha","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patr\u00edcia","family":"Janeiro","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ros\u00e1rio","family":"Fernandes","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Helena","family":"Carreiro","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ricardo","family":"Laurini","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2009,2,27]]},"reference":[{"key":"2025042507280018000_2009.feb26_1.bcr0720080595.1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-3468(94)90331-X"},{"key":"2025042507280018000_2009.feb26_1.bcr0720080595.2","doi-asserted-by":"publisher","DOI":"10.1007\/s00431-006-0134-z"},{"key":"2025042507280018000_2009.feb26_1.bcr0720080595.3","doi-asserted-by":"publisher","DOI":"10.1016\/S1084-2756(03)00029-0"},{"key":"2025042507280018000_2009.feb26_1.bcr0720080595.4","doi-asserted-by":"publisher","DOI":"10.1007\/s001060050672"},{"key":"2025042507280018000_2009.feb26_1.bcr0720080595.5","first-page":"119","article-title":"Congenital laryngeal cyst: a case report","volume":"57","author":"Marien","year":"2003","journal-title":"Acta Otorhinolaryngol Belg"},{"key":"2025042507280018000_2009.feb26_1.bcr0720080595.6","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-3468(03)00128-3"},{"key":"2025042507280018000_2009.feb26_1.bcr0720080595.7","doi-asserted-by":"crossref","first-page":"E29","DOI":"10.1016\/j.jpedsurg.2006.08.040","article-title":"Congenital laryngeal atresia associated with esophageal atresia and tracheoesophageal fistula: a case of long-term survival","volume":"41","author":"Okuyama","year":"2006","journal-title":"J Pediatr Surg"},{"key":"2025042507280018000_2009.feb26_1.bcr0720080595.8","doi-asserted-by":"publisher","DOI":"10.1055\/s-2007-972928"},{"key":"2025042507280018000_2009.feb26_1.bcr0720080595.9","doi-asserted-by":"publisher","DOI":"10.1007\/BF02019656"},{"key":"2025042507280018000_2009.feb26_1.bcr0720080595.10","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1097-0223(199706)17:6<577::AID-PD90>3.0.CO;2-M"},{"key":"2025042507280018000_2009.feb26_1.bcr0720080595.11","first-page":"759","article-title":"Laryngomucoc\u00c3\u00a9le. 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