Infant Pneumonitis Due to a Tracheoesophageal Fistula: A Presentation of Two Autopsy Cases.

Both esophageal atresia (EA) and tracheoesophageal fistula (TEF) represent a rather uncommon congenital abnormality that is the result of abnormal tracheoesophageal organogenesis. Although EA, with or without TEF, is relatively uncommon, it represents the most common upper gastrointestinal birth defect. Esophageal atresia and tracheoesophageal fistula are anatomically classified into five types according to the Gross classification (types A, B, C, D, E/H). As in type E/H, the continuity of the esophagus is not interrupted, the symptom onset is consequently delayed, and therefore diagnosis is difficult. Aspiration pneumonitis is a chemical injury caused by inhaled sterile gastric contents, while aspiration pneumonia is, in part, an infectious process because the inhaled oropharyngeal secretions are rich in bacteria. This paper aims to report two infant autopsy cases of aspiration pneumonitis with TEF involvement. The main histopathological finding was interstitial pneumonitis. Upon histopathological examination, lymphocytes, plasma cells, and macrophages were discovered on the alveolar walls, which were compatible with the chemical origin of interstitial pneumonitis. No eosinophils were detected; therefore, hypersensitivity-originating interstitial pneumonitis was ruled out. The cause of death in both cases was interstitial pneumonitis.