According to the Rotterdam consensus criteria, the ultrasound feature supporting a diagnosis of polycystic ovarian morphology is:
- A Ovarian volume greater than 10 mL or 12 or more follicles of 2 to 9 mm per ovary ✓
- B Ovarian volume greater than 25 mL regardless of follicle count
- C Presence of a dominant follicle larger than 18 mm
- D More than five simple cortical cysts measuring over 10 mm each
Correct answer: A. Ovarian volume greater than 10 mL or 12 or more follicles of 2 to 9 mm per ovary
Explanation
The Rotterdam criteria require two of three features: oligo-ovulation or anovulation, clinical or biochemical hyperandrogenism, and polycystic ovarian morphology. The morphological definition is an ovarian volume above 10 mL and/or 12 or more follicles measuring 2 to 9 mm in diameter in at least one ovary. Follicles are typically arranged peripherally around an echogenic stroma. A dominant follicle above 18 mm indicates normal cyclical activity and argues against the diagnosis.
Reference: Rumack's Diagnostic Ultrasound, 5th ed.
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Written and medically reviewed by the StethoPrep medical team.