What is endometriosis?

Updated: Dec 14, 2018
  • Author: Shawn Daly, MD; Chief Editor: Eugene C Lin, MD  more...
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Endometriosis is defined as the presence of endometrial glandular tissue outside of the uterus. In contrast, adenomyosis is endometrial tissue within the myometrium. Adenomyosis once was termed endometriosis interna but currently is recognized as a distinct clinical entity. Deep infiltrating endometriosis (DIE) represents 15 to 30% of endometriosis cases and is defined as endometriosis infiltrating the peritoneum by more than 5 mm. DIE is characterized by nodules infiltrating the rectosigmoid, uterosacral ligaments (USL), vaginal fornix, rectovaginal septum (RVS) and/or bladder. [1]

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