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paraovarian cysts

Thursday 19 June 2008

Paraovarian cysts account for 10-20% of all adnexal masses and are relatively uncommon in children. They are more common in women 30 to 40 years of age.

Paraovarian cysts arise from the tissues of the broad ligament, predominantly from mesothelium covering the peritoneum (mesothelial cysts) but also from paramesonephric (paramesonephric cysts or Mullerian cyst) and rarely mesonephric remnants (mesonephric cyst or Wolffian cyst).

They are usually incidentally discovered during surgery and prophylactic excision is performed due to the increased incidence of torsion as well as their propensity to undergo rapid enlargement.


- paramesonephric cyst
- hydatid cyst of Morgagni
- Wolffian cyst
- Kobelt cyst
- cyst of the organ of Rosenmuller

Paramesonephric cysts

The paramesonephric duct (or Mullerian duct) forms the fallopian tube at about 9 weeks of gestation. Multiple invaginations near the ostium of the tube become the fimbriae. Any secondary invagination that does not connect may form a blind sac and enlarge to form a paraovanan cyst.


- paraovarian cyst torsion (2-16%)
- hemorrhage
- rupture
- secondary infection
- neoplasatic transformation (2.9%)

  • papillary serous cystadenoma
  • endometrioid cystadenocarcinoma
  • serous cystadenocarcinoma
  • mucinous cystadenocarcinoma

Torsion of the paraovarian cyst is three times more common in pregnant women likely related to rapid growth spurt.

See also

- Cysts

  • pelvic cysts
  • paratubal cysts


- Paraovarian/paratubal cysts: comparison of transvaginal sonographic and pathological findings to establish diagnostic criteria. Savelli L, Ghi T, De Iaco P, Ceccaroni M, Venturoli S, Cacciatore B. Ultrasound Obstet Gynecol. 2006 Sep;28(3):330-4. PMID: 16823765

- Development and classification of parovarian cysts. An ultrastructural study. Stenbäck F, Kauppila A. Gynecol Obstet Invest. 1981;12(1):1-10. PMID: 7250778

- Serous papillary neoplasms arising in paramesonephric parovarian cysts. A report of eight cases. HonorĂ© LH, O’Hara KE. Acta Obstet Gynecol Scand. 1980;59(6):525-8. PMID: 7457096