from PART II - INFERTILITY EVALUATION AND TREATMENT
Published online by Cambridge University Press: 04 August 2010
Polycystic ovary syndrome (PCOS) is the most common endocrine disorder in women. Its prevalence among infertile women is 15–20 percent. The etiology of PCOS remains unclear; however, several studies have suggested that PCOS is an X-linked dominant condition (1). The clinical manifestation of PCOS varies from a mild menstrual disorder to severe disturbance of reproductive and metabolic functions. Women with PCOS are predisposed to type 2 diabetes or develop cardiovascular disease (2).
DEFINITION OF PCOS
In a workshop sponsored by ESHRE (European Society for Human Reproduction and Embryology) and ASRM (American Society for Reproductive Medicine) in Rotterdam in 2003, a new definition of PCOS was proposed (3). This consensus defined PCOS as a syndrome with two out of three of the following features: oligo- or anovulation, clinical and/or biochemical sign of hyperandrogenism, and/or sonographic finding of polycystic ovaries (after exclusion of other etiologies such as congenital adrenal hyperplasia, androgen-secreting tumors, or Cushing's syndrome) (Table 30.1).
Sonographic features of polycystic ovaries (PCO) include the presence of twelve or more follicles in each ovary measuring 2–9 mm in diameter and/or increased ovarian volume (>10 mL). This is regardless of follicle distribution, ovarian stromal echogenicity, or ovarian volume. One ovary fulfilling this definition is sufficient to define PCO (2, 4). It is recognized that some women with sonographic findings of PCO may have regular cycles without clinical or biochemical signs of hyperandrogenism.
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