Teratoma of the Tongue in a Fetus: A Case Report and Review of the Literature.

Teratomas are tumors composed of multiple embryonic germ layers of tissue, and those occurring in the tongue of the fetus are extremely rare. This paper reports the case of a 20-week-old fetus diagnosed with oral masses combined with a cleft lip and palate using prenatal ultrasonography. The patient decided to terminate the pregnancy due to economic factors after prenatal genetic consultation. The mother underwent induction termination and delivered a stillborn male fetus. The mass originated from the tongue and was pathologically confirmed as a mature teratoma by histology. Teratoma of the tongue is a rare congenital tumor that is usually benign. Its etiology is multifactorial, and prenatal karyotyping is necessary. Ultrasound is the main method of prenatal diagnosis, and magnetic resonance imaging is an effective complement to ultrasonography. Tumors can cause other malformations and abnormalities, and their location and size have an essential impact on prognosis. The imaging approach should focus on the associated abnormalities in order to assess the impact of the mass on the fetal airway and swallowing. Appropriate follow-up imaging can be helpful in the dynamic assessment of management.