Polycystic ovarian morphology is one of the criteria for diagnosing PCOS in one or both ovaries in which there is:

• enlarged size of the ovary ≥ 10 cc
• increased number of follicles per ovary (FNPO) ≥ 20
• peripherally arranged follicles 'String of pearls sign'
• echogenic central stroma
• small-sized follicles 2-9 mm