**17. Endoscopic exploration of the fertilization site**

Sometimes the fallopian tubes appear normal at HSG and even laparoscopy but pregnancy doesnot occur due to some hidden intratubal fine lesions at the fertilization site (ampulla). Intratubal examination can only be done using falloposcopy (from the cervical side) or salpingoscopy (from the fimbrial side). Going inside the tube allows proper exploration of the endosalpnix. Lost or destroyed major or minor folds may explain infertility. Detection of fine adhesions or tiny polypi is feasible by salpingoscopy.