This condition may be visible, after about 26 weeks, on an ultrasound. On antenatal USG, the finding of an absent or small stomach in the setting of polyhydramnios was considered a potential symptom of<unk> . However, these findings have a low positive predictive value. The upper neck pouch sign is another sign that helps in the antenatal diagnosis of<unk>  and it may be detected soon after birth as the affected infant will be unable to swallow its own saliva. On plain X-ray, a feeding tube will not be seen pass through the esophagus and remain coiled in the upper<unk>  pouch. Classification This condition takes several different forms, often involving one or more fistulas connecting the trachea to the esophagus (tracheoesophageal fistula). Gross Vogt Ladd Name(s) Description Frequency - Type 1 -<unk>  Agenesis Very rare complete absence of the esophagus, not included in classification by Gross or Ladd N/A Type A Type 2 I "Long Gap", “Pure” or “Isolated”<unk>  Characterized by the presence of a “gap” between the two<unk>  blind pouches with no fistula present. 7% Type B Type 3A II<unk>  with proximal TEF (tracheoesophageal fistula) The upper<unk>  pouch connects abnormally to the trachea. The lower<unk>  pouch ends blindly. 2-3% Type C Type 3B III, IV<unk>  with distal TEF (tracheoesophageal fistula) The lower<unk>  pouch connects abnormally to the trachea. The upper<unk>  pouch ends blindly. 86% Type D Type 3C V<unk>  with both proximal and distal TEFs (two tracheoesophageal fistulas) Both the upper and lower<unk>  pouch make an abnormal connection with the trachea in two separate, isolated places. <1% Type E Type 4 - TEF (tracheoesophageal fistula) ONLY with no<unk> , H-Type Esophagus fully intact and capable of its normal functions, however, there is an abnormal connection between the esophagus and the trachea. Not included in classification by Ladd 4%
Esophageal atresia
Gastric atresia
Esophageal achalasia
Hiatal hernia
Tracheoesophageal fistula
Atresia
Duodenal atresia
Situs inversus