Management of Luteal Cysts

Characteristics and Diagnosis

Luteal cysts form after ovulation when the corpus luteum fills with blood or fluid, and have a typical ultrasound appearance that includes a central cystic component with smooth thickened wall, peripheral vascularity on color Doppler, and sometimes contain avascular internal echoes or retracting clot, classified as O-RADS 2 with a <4% likelihood of malignancy 1, 2, 3

For premenopausal women, luteal cysts ≤5 cm require no additional management, while those >5 cm but <10 cm should have follow-up ultrasound in 8-12 weeks, and those ≥10 cm should be managed by a gynecologist due to increased risk 1, 4
For postmenopausal women, luteal cysts ≤3 cm require no further management, while those >3 cm but <10 cm should have at least 1-year follow-up showing stability or decrease in size, and those that are enlarging should be referred to a gynecologist 1, 4

Luteal cysts are common during pregnancy and typically resolve spontaneously, with ultrasound as the preferred imaging modality for evaluation, and surgical intervention rarely indicated unless complications occur, according to the American College of Obstetricians and Gynecologists 5

Transvaginal ultrasound is the preferred imaging modality for follow-up, with transabdominal examination considered for larger cysts, and incomplete evaluations categorized as O-RADS 0, as recommended by the American Institute of Ultrasound in Medicine 1, 4

Overtreatment of simple cysts, particularly in postmenopausal women, should be avoided, as evidence shows they rarely represent malignancy, and fine-needle aspiration of ovarian masses is contraindicated, according to the Society of Radiologists in Ultrasound 4, 6