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Anophthalmia/microphthalmia-esophageal atresia syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Anophthalmia/microphthalmia-esophageal atresia syndrome

AEG syndrome is a rare disorder characterized by abnormal development of the eyes and the esophagus, often resulting in vision loss and feeding difficulties.

Overview

Anophthalmia/microphthalmia-esophageal atresia (AEG) syndrome is a rare disorder characterized by the abnormal development of the eyes and other body parts, including the esophagus (the tube carrying food to the stomach).

Symptoms

  • Eye Abnormalities: Individuals are usually born without one or both eyes (anophthalmia) or with underdeveloped, abnormally small eyes (microphthalmia). Additional issues may include coloboma (missing tissue in eye structures) or optic nerve hypoplasia.
  • Esophageal Issues: Some are born with a blocked esophagus (esophageal atresia), often accompanied by an abnormal connection between the windpipe and esophagus (tracheoesophageal fistula).
  • Developmental: Brain abnormalities, slow growth, delayed motor skills, and intellectual disabilities.
  • Genital Abnormalities: May include undescended testes (cryptorchidism) and an unusually small penis.

Causes

Variants in the SOX2 gene cause AEG syndrome. The SOX2 protein is critical for embryonic development, particularly in regulating genes essential for the formation of the eyes and other organs. Variants result in a protein that does not function properly, disrupting the development of these structures.

Inheritance

AEG syndrome is inherited in an autosomal dominant pattern. Most cases result from new (de novo) variants occurring during the formation of reproductive cells or early embryonic development. In rare instances, it may be inherited from an unaffected parent due to germline mosaicism, where the variant is present only in the parent's sperm or egg cells.

Frequently Asked Questions

detailed ocular exam by a pediatric ophthalmologist is the first step. Orbital ultrasound or MRI clarifies the presence of absent globes versus severely reduced eye size, and assesses optic nerve and orbital structures. These images also help plan any prosthetic or surgical interventions.
The priority is to establish a safe airway and restore continuity of the esophagus. Most infants undergo primary repair within the first 24–48 hours of life, which involves closing the fistula and connecting the proximal and distal esophageal segments. If the gap is too large, staged procedures (e.g., gastric pull‑up or colon interposition) may be needed later. Post‑operative feeding is usually via a gastrostomy until swallowing function improves.
Early intervention is critical. Enroll in vision‑oriented services (low‑vision therapy, ocular prosthesis fitting), speech and feeding therapy for esophageal reconstruction, and physical/occupational therapy to address motor delays. Neurodevelopmental assessment should be repeated regularly, and individualized education plans (IEPs) are recommended once the child reaches school age.
For a truly de novo variant, the recurrence risk is low (<1 %) but not zero because of possible parental germline mosaicism. Parents may consider pre‑implantation genetic testing (PGT‑M) with IVF or prenatal diagnostic testing (CVS or amniocentesis) targeting the known SOX2 mutation if they wish. Genetic counseling can help weigh these options.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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