Management of Simple Ovarian Cysts
Characterization and Diagnosis
- Simple ovarian cysts are characterized by a unilocular structure with no internal echoes, thin walls with no solid components, no septations or papillary projections, and no vascularity on color Doppler imaging 3, 4, 5
- The American College of Radiology recommends that simple ovarian cysts be diagnosed based on these characteristics, with a focus on the absence of solid components and septations 4, 5
Management Based on Patient Characteristics
- For premenopausal women, simple cysts <5 cm require no follow-up, as they are almost certainly benign, according to the American College of Radiology 1, 6
- For postmenopausal women, simple cysts <3 cm require no follow-up, as the risk of malignancy is extremely low, as stated by the Society of Radiologists in Ultrasound (SRU) 2, 7
- The American College of Radiology recommends that simple cysts in premenopausal women be managed conservatively, as most will spontaneously resolve 4
Evidence Supporting Non-Intervention
- Large studies have shown that simple cysts, regardless of size and menopausal status, are not associated with increased cancer risk, with an absolute 3-year risk of ovarian cancer of only 0-0.5 cases per 10,000 women, similar to women with normal ovaries 1, 2, 7
- The Society of Radiologists in Ultrasound (SRU) reflects these findings with higher thresholds for follow-up, recommending conservative management for simple cysts 2
Rationale for Non-Intervention
- Simple cysts have virtually no malignant potential (<0.4%), with invasive serous cystadenocarcinoma primarily originating from solid precursors in the fallopian tube, not from simple ovarian cysts 2, 8, 9
- The risk of malignancy in benign-appearing lesions on ultrasound managed conservatively with 2-year follow-up was only 0.3% to 0.4%, according to the American College of Radiology 1
- The risk of acute complications such as torsion or cyst rupture is similarly low at 0.2% to 0.4%, as stated by the American College of Radiology 1