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Interstitial pregnancy : ウィキペディア英語版 | Interstitial pregnancy
An interstitial pregnancy is a uterine but ectopic pregnancy; the pregnancy is located outside of the uterine cavity in that part of the fallopian tube that penetrates the muscular layer of the uterus. The term cornual pregnancy is sometimes used as a synonym,〔〔 but remains ambiguous as it is also applied to indicate the presence of a pregnancy located within the cavity in one of the two upper "horns" of a bicornuate uterus.〔 Interstitial pregnancies have a higher mortality than ectopics in general. ==Anatomy== The part of the Fallopian tube that is located in the uterine wall and connects the remainder of the tube to the endometrial cavity is called its "interstitial" part, hence the term "interstitial pregnancy"; it has a length of 1–2 cm and a width of 0.7 cm.〔 Its borders are the opening (ostium) of the tube to the endometrial cavity within the uterus and, laterally, the visible narrow segment of the tube. The area is well supplied by the Sampson artery which is connected to both the uterine and the ovarian arteries. Surrounded by uterine muscle (myometrium) it can expand significantly when it hosts a pregnancy. Interstitial pregnancies can be confused with ''angular pregnancies''; the latter, however, are located within the endometrial cavity in the corner where the tube connects; typically those pregnancies are viable although a high rate of miscarriage has been reported.〔 A pregnancy located next to the interstitial section laterally is an isthmic tubal pregnancy. The definition of an ectopic pregnancy is a pregnancy outside of the uterine cavity, not outside of the uterus, as the interstitial pregnancy is still a uterine pregnancy.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Interstitial pregnancy」の詳細全文を読む
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