Arguments for a left lateral predisposition of endometrioma

Area of Science:

• Gynecology
• Reproductive Medicine
• Surgical Pathology

Background:

• Endometriosis is a complex gynecological condition.
• The pathogenesis of endometriosis, particularly endometrioma formation, remains incompletely understood.
• Existing theories do not fully explain the observed laterality of ovarian involvement.

Purpose of the Study:

• To investigate the hypothesis regarding the pathogenesis of endometriosis.
• To analyze the laterality of endometrioma occurrence in a cohort of women.
• To explore potential contributing factors to ovarian endometriosis development.

Main Methods:

• Retrospective study evaluating 251 women with endometrioma.
• Data collected from two academic endometriosis referral centers.
• Operative and pathologic reports analyzed; laparoscopic examinations performed.
• Statistical analysis included chi-squared and Mann-Whitney U tests.

Main Results:

• Endometrioma was significantly more frequent in the left ovary (67.4%) compared to the right ovary (32.6%).
• Bilateral endometriomas showed a left-sided predominance (62.1% left vs. 37.15% right).
• Dilated ovarian veins were observed in a majority of Greek cases with endometrioma, with a strong association between left endometrioma and left ovarian vein dilation.

Conclusions:

• The findings support a new mechanical theory for endometriosis pathogenesis.
• The proposed 'female varicocele theory' suggests a role for venous abnormalities in ovarian endometriosis development.
• This theory offers a potential explanation for the observed left-sided predisposition of endometriomas.