Comments:
Germ cell tumors make up about 20% of the mediastinal tumors and cysts. Their location is related to the thymus and may be completely encased within it when small. The possibility of metastases from gonadal primary must be excluded. Some cases of mediastinal germ cell tumors are associated with Klinefelter’s syndrome. The most common type seen is mature cystic teratoma (shown here).
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