Comprensive Health Assessments in RRM (CHARRM) : Polycystic Ovaries on Ultrasound - Criteria for diagnosing PCOS as outlined in the Rotterdam criteria and the Androgen Excess PCOS Society require the identification of polycystic ovaries. The most common way of doing this is by use of ultrasound. In hirsute women with normal menstruation, over 90% have polycystic ovaries on ultrasound.  Conversely, 20 – 30% of women also show evidence of multiple ovarian cysts. Specific diagnostic criteria thus are required to determine if patients truly have polycystic ovaries. This is often difficult information to ascertain from the write-ups provided by radiologists, unless they are asked specific morphologic questions.
The original criteria as outlined by the Rotterdam group were the presence of 12 or more follicles of 2 -9mm diameter and/or ovarian volume of 10cm 3 in one or both ovaries. Significant advances in imaging, particularly three-dimensional ultrasound, has resulted in some researchers proposing more advanced morphology to better identify these patients