Oral communication abstractswere enrolled in the study.Among them DE associated SP infiltration was diagnosed on TVS in 15 (1.9%) cases.SP involvement was confirmed intraoperatively in all 15 cases and verified histologically.DE lesions infiltrating the SP were hypoechoic nodules of the parametrium and the uterosacral ligaments with a median diameter of 33 mm (range, 23-45 mm).Of the 15 lesions 8 were on the right side, and 7 on the left side.The following spinal nerves were involved: S1 (8/15) S2 (13/15) S3 (8/15) S4 (3/15).At one patient the lumbosacral trunc and by another woman the right obturator nerve was also infiltrated.Associated DE in extragenital organs was found: rectum (10/15), ipsilateral ureters (7/15), bladder (6/15).Conclusions: TVS examination is reliable diagnostic tool for the detection of SP involvement by DE.Applying TVS, DE is encountered in this location in 1-2% of women attending tertiary referral centres for suspected pelvic DE.Associated DE lesions in the rectum and in the urinary tract are frequent.