A 19-year-old woman with mature pericardial teratoma.

Mediastinal teratoma accounts for 10% of congenital teratoma and 7% of all childhood germ cell tumors. Subsequently, teratomas including intrapericardial or pericardial teratoma are extremely rare. A 19-year-old woman case admitted to Moewardi General Hospital in Surakarta, Indonesia, in June 2022 was reported with chest pain radiating to her back.