Original sentence: This condition is visible, after about 26 weeks, on an ultrasound, or it may be detected soon after birth as the affected infant will be unable to swallow its own saliva
Edited sentence: However, these findings have a low positive predictive value.On antenatal USG, the finding of an absent or small stomach in the setting of polyhydramnios used to be considered suspicious of esophageal atresia.The upper neck pouch sign is another sign that helps in the antenatal diagnosis of esophageal atresia and it may be detected soon after birth as the affected infant will be unable to swallow its own saliva.This condition is visible, after about 26 weeks, on an [[ultrasound]