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畸胎瘤是多能性胚胎组织起源的一类非常特殊的肿瘤,并非发育畸形的胎块(寄生胎)。它往往含有三胚层起源的多种多样的组织,排列结构杂乱,分化程度差异很大。这些成分为其发源部位正常所不存在,且不能用化生来解释。
Teratomas are a very special type of tumor that originates from pluripotent embryonic tissues and are not developmental malformations (parasites). It often contains a variety of tissues that originate from the three germ layers. The arrangement structure is disorderly and the degree of differentiation is very different. These components do not exist at the normal site of origin and cannot be explained by metaplasia.