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We report a case of congenital thyroid teratoma that was diagnosed in fetal life and completely excised after birth. The histopathological diagnosis was immature teratoma. Recurrent nerve palsy was experienced after the complete excision, but hypothyroidism was not seen in this case. Thyroid teratoma at a neonatal age has a good prognosis when intensive respiratory care is properly administered after birth and complete excision is performed.

Congenital high airway obstruction syndrome (CHAOS) is a rare congenital anomaly and the most common etiology is laryngeal atresia. Recently, an increasing number of cases have survived due to prenatal diagnosis and pre- and peri-natal care including ex-utero intrapartum treatment (EXIT). More than 100 cases of CHAOS have been reported, and about half of them were complicated with associated anomalies. Here we report a very rare case of prenatally diagnosed CHAOS (laryngeal atresia) complicated with esophageal atresia, tracheoesophageal fistula (TEF) and duodenal atresia, and the patient was saved by EXIT. This combination of anomalies resulted in a very confusing prenatal diagnosis with unique imaging feature of the fetus.

Esophageal duplication cyst is the second most common type of duplication cyst in the alimentary tract (10–15%). However, most of these cysts occur in the mediastinal part of the esophagus and cervical esophageal duplication cyst is extremely rare. Only approximately 20 pediatric cases have been reported in the English literature. We report the case of an infant who had suffered from prolonged wheezing since birth and was finally diagnosed with esophageal duplication cyst by ultrasonography and CT examination. The cyst had a common muscular layer with the normal esophagus and mucosal stripping was performed.