The study will also consider pain reduction as a clinically relevant outcome. A recently published study by Abbott et al (2003) reported that participants undergoing laparoscopy for potential endometriosis on average rated non-menstrual pelvic pain prior to surgery as 6 on a 10-point visual analogue scale, with 10 being the worst pain. In the Abbott et al (2003) and other similar studies, laparoscopic surgery using white light was shown to be associated with a 30% reduction in pain at 6 month follow up and 50%-75% at 12 month follow up with increasing variance (Abbott et al., 2004, Jarrell et al., 2005). An RCT from Jarrell et al. (2005) showed a reduction in pain score of 1.9 (SD 0.5) at 6 month follow up and 2.6 (SD 0.5) at 12 month follow up, although the sample size of this study was small (N=16 overall, N=7 for laparoscopy arm). This study will test the hypothesis that NBI will result in an additional 20% decrease in pain compared to what has been observed in these previously published studies examining the reduction in pain using white light laparoscopy.