Fig. 1

a, Tracheal Agenesis with an upper trachea joined by atresic strand to a distal trachea that has a fistulous connection with the esophagus (classification of tracheal agenesis by Faro et al., type D). b, Postmortem specimen: pulmonary architecture and lungs development are normal. c, Upper trachea with its proximal blind end (arrow). Lower trachea opens directly into midesophagus (arrowhead). d-e, Filling of alveolar ducts and alveolar lumens with squames and squamous cells. Capillary congestion is present