Laparoscopic Ovarian Drilling Versus Letrozole In Clomiphene Citrate Resistant Polycystic Ovary

Inclusion Criteria: 1. patients diagnosed as PCOS according to Roterdam (2003) criteria 2. patients with Clomiphene resistance, i.e. failure to ovulate following 100 mg CC for 5 days for at least three cycles. 3. patent fallopian tubes, confirmed by hysterosalpingography or hysteroscopic diagnosis. 4. normal semen analysis parameters of the patients' spouses according to the modified criteria of the World Health Organization. 5. normal serum prolactin, thyroid stimulating hormone and 17-OH progesterone. 6. no systemic disease; no gonadotropin or other hormonal drug treatment during the preceding 3 months. Exclusion Criteria: 1- Infertility induced by reasons other than PCOS. 2- uterine cavity lesions or ovarian cyst. 3- \>40 years old. 4- body mass index (BMI) \>26 kg/m2. 5- contraindications to general anesthesia. 6- history of pelvic surgery. 7- other endocrine diseases. 8- a history of liver or kidney disease. \-