Isthmic
Implantation close to the uterus may involve the isthmic portion of the fallopian tube.
The central (inner) lumen within the isthmic portion of the tube has a thick muscular sheath that usually "entraps" an ectopic pregnancy within the lumen. Therefore, as the pregnancy grows the lumen of the tube may be destroyed. If the lumen of the tube has been significantly damaged, it may not be possible to spare (save) the tube during surgery.
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