Fig. 27. Teratoid medulloepithelioma. This teratoid tumor contains large basophilic foci of hyaline cartilage. The myxoid stroma contains cords and ribbons of neuroepithelial cells. Teratoid medulloepitheliomas may contain other heteroplastic elements such as striated muscle, rhabdomyoblasts, and brain. (Hematoxylin and eosin, × 25)