Prenatal diagnosis of type 1 tracheal agenesis without tracheoesophageal fistula.

Tracheal agenesis is a rare and uniformly lethal congenital malformation. We recently had the opportunity to diagnose prenatally a case of type I tracheal agenesis without fistula in a 22-week-old fetus, in which the hyperechogenicity of the enlarged lungs was associated with ascites, and tracheal dilatation in the lower half. We report the ultrasonographic and autopsy findings and review the literature on this rare condition to contribute to the understanding of type 1 tracheal agenesis without tracheoesophageal fistula.