畸胎瘤是由多胚层组织结构组成的生殖细胞肿瘤,肿瘤实质由3个胚层衍生物所构成,偶见含一个胚层成分。最常见于卵巢和睾丸,偶可见于颈、纵隔、骶尾部、松果体及腹膜后等部位。分为成熟性、未成熟性及卵巢单胚层和高度特殊性畸胎瘤。发生于输卵管的畸胎瘤极为罕见,其发生机制目前尚未明确,异位种植的卵裂球假说得到较多认可,可能为胚胎早期生殖细胞向卵巢移行 Teratoma is a germ-cell tumor composed of the tissue structure of the germ layer. The tumor parenchyma consists of three germ layer derivatives, occasionally containing a germ layer component. The most common in the ovary and testis, even seen in the neck, mediastinum, sacrococcygeal, pineal and retroperitoneal and other parts. Divided into maturity, immaturity and ovarian germinal layers and highly specific teratoma. Occurrence of tubal teratoma is extremely rare, the mechanism is not yet clear, the ectopic planting blastomere hypothesis to get more recognition, may be early embryonic germ cells to the ovary