Anterior mediastinal teratoma with pericardial effusion. Rare presentation.

Mediastinal teratoma is an uncommon finding in the pediatric age group, accounting for only 7-11% of extragonadal teratomas. Rarely, the tumor can rupture and erode into the pericardium or pleural space. However, pericardial effusion due to rupture is infrequent. We report a case of such a rare presentation in a 10-year-old young female. The patient underwent a mediastinal tumor excision. Histopathology revealed that there was ruptured mature cystic teratoma with inflammatory reaction. Numerous cases of mediastinal teratoma with pericardial effusion have been reported but only few have been presented in the pediatric age group.