- Ovarian cysts are the fourth most common cause of admission to hospital; 4% of women are admitted to hospital with an ovarian cyst by the age of 65 years ( Sorinola et al 2002)
- In pre-menopausal women only 0.1–0.3% of cysts are malignant and most resolve in 2-3 menstrual cycles.
- The incidence of ovarian cancer is 0.4–0.8/100 000 women. (RCOG GTG 62)In post-menopausal women the incidence of cysts is 5-17% with an incidence of ovarian cancer of 60/100 000.
- Cysts <1 cm usually are inconsequential.
- 25% of adnexal torsions occur in children.
- Two-thirds of corpus luteal cysts involve the right ovary.
Ovarian cyst events include:
- cyst rupture
- cyst haemorrhage
- adnexal torsion
- pressure effects of the cyst – e.g DVT, urinary retention, intestinal obstruction.
Timmerman D, Valentin L, Bourne TH, Collins WP, Verrelst H, Vergote I; International Ovarian Tumor Analysis (IOTA) Group. Terms, definitions and measurements to describe the sonographic features of adnexal tumors: a consensus opinion from the International Ovarian Tumor Analysis (IOTA) Group. Ultrasound Obstet Gynecol 2000;16:500–5.
Timmerman D, Schwärzler P, Collins WP et al. Subjective assessment of adnexal masses with the use of ultrasonography: an analysis of interobserver variability and experience. Ultrasound Obstet Gynecol 1999;13:11–6.