Mediastinum    most common extragonadal location in which germ cell tumors are found  extends from the posterior aspect of the sternum to the anterior surface of the vertebral bodies and includes the paravertebral  the etiology of germ cell tumors of the mediastinum remains unknown    Germ Cell Tumor   Benign germ cell tumors are referred to as benign teratomas or dermoids if they are solid  Benign germ cell tumors are referred to as  epidermoid or dermoid cysts if they are cystic  For malignant germ cell tumors, it is divided into  into seminomas and nonseminomatous     Pathophysiology    Because of the malleable nature and small size of the pediatric airway and other normal mediastinal structures, benign tumors and cysts can produce local symptoms  Compression or obstruction of portions of the airway, the esophagus, or the right heart and great veins by an enlarging tumor or cyst easily can occur and can result in a number of symptoms  pproximately 95% of patients with ...
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