Fig. 1

Gross specimen of the tumor, after the first surgery, with muscle fascia (a) and epidermis side (b). c Histological section showing immature teratoma (left), represented by blocks of undifferentiated neoplasm (asterisk). On the right, areas of mature teratoma composed of well differentiated tissue with corneal cysts (arrows) and islands of adipose tissue (arrowhead). (Hematoxylin & Eosin, 40× magnification); d Island of cartilaginous tissue of mesodermal lineage (mature teratoma), surrounded by undifferentiated cells (immature teretoma), (Hematoxylin & Eosin, 100× magnification); e areas of immature teratoma composed of blocks of undifferentiated neoplasm. In the lower picture, small undifferentiated cells with mitotic figures (arrows), (Hematoxylin & Eosin, 100× magnification, and lower frame 400× magnification); f Immature teratoma composed of small undifferentiated cells with foci of primitive neuroectodermic differentiation forming neuroepithelial elements (arrows), (Hematoxylin & Eosin, 400× magnification)