Mediastinal Germ Cell Tumors
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Mediastinal tumors comprise four percent of all germ cell tumors and six to 20% of all mediastinal masses seen in children . Germ cell tumors are secondary in incidence in the mediastinum to neurogenic tumors and lymphomas .
Age and gender play an important role in the behavior of mediastinal germ cell tumors. These tumors have been reported from newborns to adulthood. However, mediastinal germ cell tumors are most common in adolescents . In childhood, these tumors are often benign. Conversely, in adolescence they often display aggressive behavior or contain malignant elements . In infancy and childhood, incidence of malignant germ cell tumors (MGCT) is slightly higher for female patients, whereas the incidence of MGCT is slightly higher for male patients in adolescence . The overall malignancy rate is approximately 14% in children and the chance of malignancy is higher in males than females .
see also Extragonadal Germ Cell Tumors