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Septum Oesophagotracheale – Definition and Malformations

The septum oesophagotracheale is an embryonic dividing wall that separates the esophagus from the trachea during fetal development. Malformations can lead to life-threatening connections between these two structures.

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Things worth knowing about "Septum oesophagotracheale"

The septum oesophagotracheale is an embryonic dividing wall that separates the esophagus from the trachea during fetal development. Malformations can lead to life-threatening connections between these two structures.

Definition

The septum oesophagotracheale is an embryonic structural partition that forms during early fetal development between the primitive foregut and the developing respiratory tract. It is a longitudinal fold of mesenchymal tissue that divides the shared foregut tube into the esophagus and the trachea.

Embryology and Development

During early embryonic development (approximately weeks 4 to 6 of gestation), the future digestive and respiratory tracts share a common channel. The septum oesophagotracheale grows in a caudal-to-cranial direction, progressively separating this common channel into two distinct tubes:

Ventral (front): The trachea, which branches into the bronchi and eventually the lungs
Dorsal (back): The esophagus, which connects the pharynx to the stomach

This separation process is a critical step in embryonic organogenesis and must occur with precise spatial and temporal coordination.

Clinical Relevance: Malformations

Disruption of the normal formation of the septum oesophagotracheale leads to serious congenital malformations. The most common consequence is a tracheoesophageal fistula (TEF), often in combination with esophageal atresia.

Esophageal Atresia

Esophageal atresia occurs when the esophagus does not form as a continuous tube and ends in a blind pouch, preventing food from reaching the stomach. This condition affects approximately 1 in 3,500 newborns.

Tracheoesophageal Fistula (TEF)

A tracheoesophageal fistula is an abnormal connection between the trachea and the esophagus, resulting from incomplete formation of the septum oesophagotracheale. The most common form (Vogt type C) involves esophageal atresia with a distal tracheoesophageal fistula. Clinical signs in newborns may include:

Foamy saliva and choking at the first feeding
Cyanosis (bluish skin discoloration) during feeding
Aspiration pneumonia due to entry of food or gastric contents into the lungs
Abdominal distension caused by air entering the stomach through the fistula

Laryngotracheoesophageal Cleft

A rarer malformation is the laryngotracheoesophageal cleft, in which the septum between the larynx, trachea, and esophagus is incompletely formed, resulting in a broad communication between the airway and the food passage.

Diagnosis

Malformations related to the septum oesophagotracheale are frequently detected prenatally or immediately after birth:

Prenatal diagnostics: Ultrasound may show indirect signs such as polyhydramnios (excess amniotic fluid) resulting from impaired fetal swallowing
Postnatal diagnostics: Attempted nasogastric tube insertion (fails in atresia), plain X-ray with air or contrast medium, bronchoscopy and esophagoscopy for precise localization of a fistula

Treatment

Treatment of malformations of the septum oesophagotracheale is primarily surgical and must be performed promptly after birth:

Surgical repair of esophageal atresia: Joining the two ends of the esophagus (end-to-end anastomosis) and closure of any associated fistula
Fistula closure: Surgical division and closure of the abnormal connection between the trachea and esophagus
Intensive neonatal care: Mechanical ventilation, parenteral nutrition, and infection prophylaxis until the newborn is stabilized

With timely surgical intervention and in the absence of severe associated anomalies, the prognosis is generally favorable.

References

Sadler TW - Langman's Medical Embryology, 14th Edition, Wolters Kluwer, 2019
Spitz L - Oesophageal atresia. Orphanet Journal of Rare Diseases, 2007; 2:24. PubMed PMID: 17498294
World Health Organization (WHO) - Congenital anomalies, Fact Sheet, 2023. Available at: https://www.who.int/news-room/fact-sheets/detail/congenital-anomalies

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