子宫内膜异位症是具有活动功能的子宫内膜出现于正常子宫腔内壁以外的部位。异位内膜的活动功能表现为增生及流血,常是但并不总是周期性的。病变部位几乎无所不及,临床表现广泛,可出现许多令人迷惑不解的症状。在组织学上是良性的,但在行为上某些方面与癌瘤相似,例如异位出现,浸润性倾向,增生能力,侵犯及穿透器官的能力,以及经血管及淋巴管扩散至远处的潜能,但它不消化宿主的组织,不产生恶病质,生长缓慢,还依赖于卵巢的功能。 Endometriosis is an active endometrium that appears outside the walls of the normal uterine cavity. Ectopic endometrial activity manifested as hyperplasia and bleeding, often but not always periodic. Almost everywhere lesions, clinical manifestations of a wide range, there may be many puzzling symptoms. Is histologically benign, but resembles a cancer in some aspects of behavior such as ectopic appearance, invasive propensity, hyperplasia ability, ability to infiltrate and penetrate organs, and distant spread through blood vessels and lymphatic vessels But it does not digest the host’s tissue, does not produce cachexia, grows slowly, and relies on ovarian function.