ObjectiveDesign A prospective study.Setting The Northern Endometriosis Centre at South Cleveland Hospital, Middlesbrough and St.James's University Hospital, Leeds.Population Fifty-seven consecutive patients undergoing laparoscopic excision of invasive endometriosis.Methods Questionnaires, both pre-operatively and four-month post-operatively, for a number of different symptoms associated with endometriosis were completed by patients. Details of fertility, previous treatments and quality of life as measured by SF12 and EuroQOL (EQ-SD) and sexual activity questionnaire, as well as linear pain scores for several symptoms, were recorded. Details of intra-operative findings was also collected.Main outcome measures Effect of laparoscopic excision on pain scores and quality of life, operative findings, type of surgery, length of surgery and incidence of intra-and post-operative complications.Results Patients with endometriosis were severely ill with significant pain and impairment of quality of life and sexual activity. Four months after radical laparoscopic excision for deep endometriosis there was significant improvement in all the parameters measured including their quality of life based on EuroQOL evaluation: EQ-SD (0.595:0.729, P = 0.002) and EQ thermometer (68.9:77-7, P = 0.008); SF12 physical score (44.8:51.9, P = 0.015); sexual activity (habit P = 0.002, pleasure P = 0-002 and discomfort P IO.001). Only the mental health score of SF12 failed to show any statistical improvement (47.1:48.4, P = 0.84). Symptomatically, there was a significant reduction in dysmenorrhoea (median 8-0:4.0, P I 0-OOl), pelvic pain (median 7.0:2.0, P IO.OOl), dyspareunia (median 6.0:0.0, P I 0.001) and rectal pain scores (median 4-0:0.0, P I 0-001). Complications were noted, but were deemed to be acceptable for the extent of the surgery.Conclusions This is an early analysis of the first 57 cases studied, but structured evaluation suggests that meaningful improvements in clinical symptoms and quality of life can be obtained with this approach with acceptable levels of operative morbidity. Further follow up of this series is required, but early evidence would suggest that the technique should be further evaluated as part of a randomised trial.To assess the effect of endometriosis and radical laparoscopic excision on the quality of life of women with this conhtion.