Preoperative endoscopic ultrasonography wall-layer stratification and bowel surgical management in rectosigmoid deep infiltrating endometriosis: a single-center retrospective study
This single-center retrospective study of 25 patients demonstrates that higher preoperative endoscopic ultrasonography (EUS) wall-layer grades in rectosigmoid deep infiltrating endometriosis are significantly associated with more extensive bowel surgical management, suggesting EUS is a valuable tool for surgical planning and counseling despite not being a standalone indicator for segmental resection.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Deep infiltrating endometriosis is a condition where tissue similar to the lining of the uterus grows deep into the pelvic cavity, often attaching to organs like the bowel. When this tissue invades the rectosigmoid area—the lower part of the large intestine just before the rectum—it can cause severe pain, difficulty with bowel movements, and other debilitating symptoms. Treating this condition is a delicate balancing act for surgeons. They must remove the diseased tissue to relieve pain, but they also want to avoid removing too much healthy bowel, which can lead to significant complications. The surgical options range from simply shaving the tissue off the bowel surface to cutting out a small disc of the wall, or in more severe cases, removing a whole segment of the intestine and reconnecting the ends. The critical challenge is knowing before the operation exactly how deep the disease has penetrated the bowel wall, so the surgical team can prepare for the right level of intervention without surprising the patient or the operating room staff.
To address this uncertainty, researchers at Xijing Hospital in China conducted a study looking back at the records of twenty-five women who had surgery for this specific type of endometriosis between 2018 and 2024. Before their operations, these patients underwent a specialized imaging test called endoscopic ultrasonography. This procedure involves passing a small ultrasound probe through the rectum to create a detailed cross-section of the bowel wall, allowing doctors to see the individual layers of tissue. The medical team used these images to assign a grade to each patient, ranging from zero to three, based on how deep the endometriosis appeared to reach. A grade of zero meant no clear involvement, while higher numbers indicated the disease had reached deeper layers, such as the muscle or the inner lining of the bowel. The researchers then compared these preoperative grades with the actual surgeries performed, which were also categorized from zero to three based on how much bowel tissue had to be removed or repaired.
The study found a clear and strong connection between what the ultrasound showed before surgery and what the surgeons actually had to do during the operation. Women whose scans suggested deeper involvement were significantly more likely to undergo more extensive surgical procedures. Specifically, among the patients whose scans indicated moderate to deep involvement, nearly two-thirds required a segmental resection, where a section of the bowel is removed and reconnected. In contrast, none of the patients whose scans showed only superficial or no involvement needed this major procedure. The data also revealed that patients with deeper disease, as predicted by the scans, experienced longer operations, lost more blood, and stayed in the hospital for more days compared to those with shallower disease. This suggests that the ultrasound grading system is a reliable way to anticipate the complexity of the surgery.
The researchers also compared these ultrasound findings with magnetic resonance imaging, or MRI, which is another common tool used to map pelvic disease. In the group of patients who had both tests, the ultrasound identified bowel involvement in a higher percentage of cases than the MRI did, though the difference was not large enough to be statistically definitive. This indicates that while MRI provides a broad view of the entire pelvis, the ultrasound offers a more focused, detailed look at the specific layers of the bowel wall. The authors emphasize that the ultrasound results should not be used as a standalone rule to decide on surgery. Instead, the test serves as a powerful tool for preparation. It helps doctors and patients have informed conversations about what might happen in the operating room, allowing the surgical team to bring in colorectal specialists if necessary and ensuring that the patient is mentally and physically ready for the full range of possible outcomes. Ultimately, the study confirms that looking closely at the bowel wall layers before surgery provides a practical roadmap for managing this complex condition.
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