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Corpus luteum cyst

Corpus luteum cyst ultrasound case study

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Ovarian Pathology

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corpus luteum cyst ultrasound case study

Case Study Record

SN	Case Name	Report Line
1	Left corpus luteum cyst with GS	View Report Line
2	Lt. ovarian Corpus luteum cyst ("ring of fire" sign).	View Report Line
3		-
4	-	-
5	-	-

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CASE–1
Early Intrauterine Pregnancy with Left Ovarian Corpus Luteum Cyst

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Clinical History

A 28-year-old female presented with a positive urine pregnancy test and amenorrhea. Pelvic ultrasound was performed for confirmation and dating of pregnancy.

Ultrasound Findings

Ultrasound examination demonstrates an intrauterine gestational sac (GS) corresponding to an estimated gestational age of approximately 4 weeks 6 days. A well-defined, thin-walled unilocular cyst is noted within the left ovary. The cyst demonstrates posterior acoustic enhancement without internal septations, mural nodules, papillary projections, or solid components. No internal vascularity is identified on Color Doppler examination. The right ovary appears normal. No adnexal mass or free fluid is seen in the pelvis.

Pelvic ultrasound. Transverse sonographic image demonstrates an early intrauterine gestational sac (GS) and a 35 × 42 mm left ovarian corpus luteum cyst with a thin wall, posterior acoustic enhancement, and no suspicious internal features.

Report Line

An intrauterine gestational sac (GS) corresponding to approximately 4 weeks 6 days is identified. A 35 × 42 mm thin-walled unilocular cyst is present within the left ovary, demonstrating posterior acoustic enhancement without septations, mural nodules, papillary projections, or internal vascularity. Findings are consistent with a physiological left ovarian corpus luteum cyst of pregnancy.

Impression

Early intrauterine pregnancy with gestational sac (approximately 4 weeks 6 days).
Physiological left ovarian corpus luteum cyst

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Recommendation

Routine obstetric follow-up is recommended. A follow-up ultrasound in 1–2 weeks may be performed to confirm yolk sac, fetal pole, and cardiac activity as appropriate. The corpus luteum cyst is a normal physiological finding in early pregnancy and typically regresses spontaneously by the second trimester.

Key Learning Points

• The corpus luteum cyst is a normal physiological finding during early pregnancy and supports progesterone production until placental function is established.
• It typically appears as a thin- or mildly thick-walled cyst with posterior acoustic enhancement and may measure up to 5 cm.
• Most corpus luteum cysts resolve spontaneously by the second trimester (14–16 weeks).
• Simple cystic morphology without solid components, papillary projections, or vascular nodules favors a benign diagnosis.
• Routine follow-up is generally sufficient unless the cyst enlarges, becomes symptomatic, or develops complex features.

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CASE–2
Left ovarian Corpus Luteum Cyst

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Clinical History

A 28-year-old female presented with a positive urine pregnancy test and amenorrhea. Pelvic ultrasound was performed for confirmation and dating of pregnancy.

Pelvic ultrasound. Transverse sonographic image demonstrates an a 35 × 42 mm left ovarian corpus luteum cyst with a thin wall and posterior acoustic enhancement. Color Doppler demonstrates the characteristic peripheral hypervascular "ring of fire" appearance, consistent with a physiological corpus luteum cyst.

Report Line

A 35 × 32 mm thin-walled unilocular cyst is present within the left ovary, demonstrating posterior acoustic enhancement and peripheral circumferential vascularity ("ring of fire" sign) on Color Doppler, without internal vascularity, septations, mural nodules, or papillary projections. Findings are consistent with a physiological left ovarian corpus luteum cyst.

Impression

Physiological left ovarian corpus luteum cyst.Characteristic peripheral "ring of fire" vascularity on Color Doppler.

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