An observational study in Endometriosis, Endometriosis Rectum and Endometriosis Pelvic, sponsored by Erasme University Hospital. Not yet recruiting at 1 site in Belgium. Open to female participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-10-28.
Sponsored by Erasme University Hospital · Observational
This retrospective single-centre study evaluates how accurately preoperative ultrasound detects bowel involvement in women with deep endometriosis, using surgical findings as the reference. It also assesses whether ultrasound correctly locates and measures bowel lesions, and whether ultrasound lesion size predicts the type of bowel surgery performed (shaving, discoid excision or segmental resection). Data come from the medical records of patients operated at the Endometriosis Clinic of Hôpital Erasme, Brussels.
Deep endometriosis involving the bowel requires accurate preoperative mapping to plan surgery and counsel patients. Expert transvaginal ultrasound is recommended as a first-line imaging tool, but its real-world diagnostic performance and its value for predicting the surgical technique need further evaluation.
This is a retrospective, observational, single-centre cohort study. Patients who underwent surgery for suspected or confirmed deep endometriosis at the Endometriosis Clinic of Hôpital Erasme (HUB, Brussels) between 2018 and 2028 will be identified from the clinic database. Preoperative ultrasound reports will be compared with operative reports and histopathology.
Collected variables include ultrasound presence, location and size of bowel lesions; surgical findings and technique (shaving, discoid excision, segmental resection); and histopathological lesion size. No additional examinations or contacts with patients are planned. A waiver of informed consent has been requested from the Ethics Committee given the retrospective design.
A preliminary analysis covering patients operated between 2018 and 2025 will be performed first.
920 studies on the registry are indexed under Endometriosis; 266 are open to participants now.
This study's planned enrollment of 100 is below the median of 135 across 349 observational studies indexed under Endometriosis.
Browse Endometriosis studies →Erasme University Hospital is the lead sponsor of 181 studies on the registry; 35 are open to participants now.
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Women operated for deep endometriosis at the Endometriosis Clinic of Hôpital Erasme (Brussels) between 2018 and 2028
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Exclusion Criteria:
Women who had a preoperative expert ultrasound and surgery at the Endometriosis Clinic of Hôpital Erasme between 2018 and 2028
Diagnostic Test: preoperative transvaginal ultrasound
Routine preoperative ultrasound performed as part of standard care in patients with a suspected deep infiltrating endometriosis
Sensitivity of Transvaginal Ultrasound for Bowel Endometriosis Compared With Surgical Findings Confirmed by Histopathology
Percentage of patients with bowel endometriosis found at surgery (operative report) and confirmed by histopathology who were correctly identified as having bowel involvement on preoperative transvaginal ultrasound. Unit: % of patients.
Time frame: From preoperative transvaginal ultrasound to surgery and histopathology report, up to 24 months (an average of 3 months)
Percentage of Bowel Lesions With Concordant Location on Transvaginal Ultrasound and at Surgery
Percentage of surgically confirmed bowel lesions whose location on preoperative transvaginal ultrasound (rectum, rectosigmoid junction, sigmoid colon) matches the location described in the operative report. Unit: % of lesions.
Time frame: From preoperative transvaginal ultrasound to surgery, up to 24 months (an average of 3 months)
Correlation Between Bowel Lesion Diameter on Transvaginal Ultrasound and on Histopathology
Spearman's rank correlation coefficient between the largest bowel lesion diameter measured on preoperative transvaginal ultrasound (mm) and the largest lesion diameter measured on the histopathology report (mm). Unit: Spearman's rho.
Time frame: From preoperative transvaginal ultrasound to histopathology report, up to 24 months (an average of 3 months)
Percentage of Patients Undergoing Segmental Resection According to the Largest Axis of the Bowel Lesion on Transvaginal Ultrasound (< 3 cm vs ≥ 3 cm)
Percentage of patients treated by segmental bowel resection, the most radical surgical technique, versus conservative techniques (shaving or discoid excision), as recorded in the operative report, in the group with a bowel lesion largest axis \< 3 cm on preoperative transvaginal ultrasound and in the group with a largest axis ≥ 3 cm. This outcome aims to assess whether lesion size on ultrasound can predict the need for the most radical surgery. Unit: % of patients.
Time frame: From preoperative transvaginal ultrasound to surgery, up to 24 months (an average of 3 months)
Plan to share: No — Individual data come from hospital medical records and will not be shared, in line with GDPR and the ethics approval
No publications or documents are linked to this record.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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