摘要: Teratoma of the pineal body is surprisingly rare considering many possibilities for that type tumor formation inherent in body. The literature contains reports only thirteen cases proved teratoma, four teratoid and one case chorionepithelioma These constitute approximately 10 per cent all reported tumors To this series there here added a new case, which unique it presents first time stages development adult teeth. DEFINITION AND CLASSIFICATION OF EMBRYONAL NEOPLASMS1 Considerable confusion exists on subject embryonal mixed body, largely because lack uniformity terminology applied. At very beginning paper, therefore, definition classification terms we shall use will be made. This