Bowel Endometriosis Surgery

Where bowel endometriosis occurs

The rectum and sigmoid colon are the most common locations. Lesions often sit on the anterior surface of the bowel, in the pouch of Douglas area, and may extend into the recto-vaginal septum. Less commonly, endometriosis affects the appendix, cecum, or small bowel. Multifocal disease along the bowel is possible and influences the surgical plan.

Symptoms that may suggest bowel involvement

• Painful bowel movements around menstruation (dyschezia)
• Cyclic constipation or diarrhea
• Rectal bleeding around periods
• Bloating and abdominal distention
• Deep pain with intercourse
• Nausea and cramping worse with menstruation

Some patients have minimal bowel symptoms even with significant disease, which is why imaging matters.

How bowel disease is mapped

Endometriosis-protocol ultrasound and MRI evaluate lesion location, depth of infiltration into the bowel wall, length along the bowel, number of lesions, and distance from the anal verge. This map guides the choice of surgical technique and the composition of the surgical team. See MRI & Ultrasound Mapping.

Surgical options

Shaving

The bowel serosa is shaved to remove superficial disease while preserving the underlying muscular and mucosal layers. Considered for superficial serosal lesions without full-thickness invasion.

Disc excision

A full-thickness disc of bowel wall containing the lesion is removed and the defect closed primarily. Considered for localized, deeper lesions typically under a certain size threshold.

Segmental resection with anastomosis

A segment of bowel containing the disease is removed and the two ends reconnected. Considered for more extensive, multifocal, or deeply invasive disease, disease causing narrowing (stenosis), or when disc excision would compromise closure.

What determines the choice

• Depth of infiltration into the bowel wall
• Length and number of lesions
• Location and distance from the anal verge
• Degree of bowel narrowing
• Surgeon and team experience
• Patient priorities (fertility, function, symptoms)

Is a stoma required?

Most patients do not require a stoma. A temporary diverting ileostomy may be considered in selected cases (for example, very low rectal anastomosis) to protect healing. This possibility is discussed individually before surgery.

Recovery and follow-up

• Hospital stay varies by technique — typically 1–2 days for shaving/small disc, longer for segmental resection
• Gradual diet progression as tolerated
• Bowel function monitoring in the early postoperative period
• Early mobilization, pain and nausea management
• Individualized long-term plan for hormonal support and follow-up imaging when indicated

Why colorectal collaboration matters

Bowel endometriosis surgery is best performed by an experienced endometriosis surgeon working with a colorectal surgeon in the same operating room, with the flexibility to shift between shaving, disc, and resection based on intraoperative findings. See Multidisciplinary Team.