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[Rapidly Growthing Mediastinal Cystic Teratoma with Suggestive Perforation by Infection in Pregnancy].

The patient was a 34-year-old female and was 32 weeks pregnant. She was admitted to our department because of mediastinal cyst with infection. She complained of chest pain. Chest computed tomography(CT) revealed the rapid growth of anterior mediastinal tumor. The pain increased after 2 days and magnetic resonance imaging (MRI) suggested the rupture of teratoma. After delivery by Caesarean section, we performed abscess drainage, to stabilize the patient's condition and thereafter the resection of mediastinal teratoma with partial resection of right lung was performed. Histological findings showed a mature teratoma.