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This article, published in the journal Ultrasound in Obstetrics & Gynecology, discusses a study that aimed to obtain fetal upper esophagus biometry and identify a second trimester marker for esophageal atresia (AE). The study enrolled single physiological pregnancies between 19 and 23 weeks and performed 2D and 3D ultrasound evaluations of the upper esophagus. The results showed that a thickening in a specific area of the esophagus, referred to as "P2," correlated with a subsequent esophageal pouch (EP) and AE. However, further studies are needed to confirm these findings due to the rarity of the disease and the small sample size. [Extracted from the article]