Linear Echo Cyst in Left Ovary: Meaning, Differential, and Next Steps

A linear echo cyst in the left ovary describes a fluid-filled structure with thin, linear internal echoes (debris, fibrin strands, or septations) on ultrasound.

Common Causes

• Corpus luteum cyst (most likely): Post-ovulatory; may have internal echoes from hemorrhage. Typically resolves in 1–2 cycles.
• Hemorrhagic cyst: Blood within a follicular or corpus luteum cyst; lace-like or reticular echoes. Resolves spontaneously.
• Endometrioma: "Chocolate cyst" – classically low-level homogeneous echoes ("ground glass"), but can have linear strands.
• Dermoid cyst (mature cystic teratoma): May show echogenic lines (hair, fat-fluid level, Rokitansky nodule).
• Neoplastic: Borderline or malignant tumors may have solid components, papillary projections, thick septa, vascularity on Doppler.

Next Steps

1. Follow-up ultrasound in 6–8 weeks (next menstrual cycle) for likely functional cysts.
2. Doppler ultrasound to assess vascularity (low in functional, high in neoplastic).
3. CA-125 if >40 years or suspicious features (not specific).
4. MRI for complex characterization.
5. Clinical correlation: Age, symptoms, menopausal status, family history.

Most linear echo cysts in reproductive-age women are benign and self-limiting. Postmenopausal cysts warrant lower threshold for surgery.