Tracheoesophageal fistula: Intense edema of the entire tracheal mucosa, with extensive areas of submucosal hemorrhage.
The edema becomes irregular in the posterior wall and a U-shaped fissure occupies the center of the image.
The dark coloration of its path is due to the methylene blue instilled in the esophagus for its detection.
Isidoro R., Sinus Tracheal Fissure.
RAMR 2015; 3: 211-212.