en Gynecology & Obstetrics Gynecology & Obstetrics Original Research Original Research Two-hundred and seventeen subjects underwent transvaginal ultrasound -17 (8%) had unilateral polycystic ovary (PCO). Twelve percent of subjects with unilateral scan-pea had oligomenorrhea, 24% were amenorrheic, 23% were hirsute and 29% had acne. Biochemical parameters were compared between subjects with unilateral scan- PCO and those with bilateral scan- PCO (n=200) as well as a group of scan-normal women (n=29). No significant difference was found between subjects with bilateral and unilateral scan- PCO suggesting that these 2 groups are biochemically similar. The existence of unilateral scan- PCO suggests that peas may be a primary ovarian disorder. Polycystic ovary syndrome, Unilateral polycystic ovary, Primary ovarian disorder. 19 22 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-298-347&slc_lang=en&sid=1 SHAYESTEH JAHANFAR 20031947532846004474 20031947532846004474 No Ob-Gyn, Iran University of Medical JOHN A. EDEN 20031947532846004475 20031947532846004475 Yes From the School of Obstetrics and Gynecology, Frank Ru ndle House, Royal Hospital for Women, 188 Oxford St., Paddington, NSW, Australia, 2021.