Endometriosis: pathogenetic implications of the anatomic distribution

Area of Science:

• Gynecology
• Reproductive Medicine
• Surgical Pathology

Background:

• Endometriosis is a condition where endometrial-like tissue grows outside the uterus.
• The exact mechanisms of endometriosis development are still debated.
• Understanding the anatomic distribution of ectopic endometrium is crucial for diagnosis and treatment.

Purpose of the Study:

• To reassess the anatomic distribution of ectopic endometrial implants and adhesions.
• To investigate the relationship between uterine position and the location of endometriosis.
• To evaluate factors influencing the implantation of ectopic endometrium.

Main Methods:

• Laparoscopic study of 182 consecutive patients with infertility and endometriosis.
• Detailed mapping of implant and adhesion locations.
• Assessment of uterine position (anterior vs. posterior, anteflexed).

Main Results:

• The ovary was the most frequent site (54.9%), followed by the posterior broad ligament (35.2%), anterior cul-de-sac (34.6%), posterior cul-de-sac (34.0%), and uterosacral ligament (28.0%).
• Adhesion formation mirrored the distribution of implants.
• Endometriosis in the anterior compartment was significantly more common in patients with anterior uteri (40.7%) compared to posterior uteri (11.8%).
• Exclusive anterior compartment disease occurred only in patients with anterior uteri.

Conclusions:

• Uterine position is a significant factor influencing the anatomic distribution of endometriosis, particularly in the anterior pelvic compartment.
• Factors such as peritoneal fluid dynamics, epithelial cell type, ovarian susceptibility, and pelvic structure mobility likely contribute to endometriosis development.
• The findings support the Sampson hypothesis of retrograde menstruation as the primary cause of endometriosis.