Optimal Use of Computed Tomography in Diagnosing Internal Herniation After Roux-en-Y Gastric Bypass: A Proposition for the Application of a Radiological Prediction Score

Category	Detail
Condition	Internal herniation after Roux-en-Y gastric bypass (RYGB)
Key Mechanisms	Internal herniation causing intestinal ischemia and abdominal pain; diagnosis via CT signs and laparoscopy
Target Population	Patients presenting with abdominal pain more than 30 days post-RYGB
Care Setting	High-volume bariatric centers and radiology departments using CT and diagnostic laparoscopy

Internal herniation incidence post-RYGB ranges from 1–12%, with serious complications including ischemia and sepsis.
Clinical diagnosis is challenging; diagnostic laparoscopy is gold standard but often negative, leading to unnecessary invasive procedures.
Structured CT assessment using specific radiological signs improves diagnostic accuracy over free text reporting.

Use abdominal CT-scanning with structured assessment of specific CT signs to evaluate suspected internal herniation.
Consider diagnostic laparoscopy when CT signs and clinical suspicion indicate internal herniation.
Recognize that clinical symptoms alone are insufficient for diagnosis due to variable presentation.

Perform diagnostic laparoscopy in patients with high suspicion of internal herniation based on CT and clinical findings.
Ensure mesenteric defects are closed during RYGB to reduce herniation risk.

Monitor patients post-RYGB presenting with abdominal pain for signs of internal herniation.
Use radiological prediction scores to guide decision-making and reduce unnecessary invasive procedures.

Delayed or missed diagnosis of internal herniation can lead to intestinal ischemia, sepsis, and death in 1–2% of cases.
Unnecessary diagnostic laparoscopy exposes patients to invasive risks and healthcare costs without confirming herniation.

Patients post-RYGB presenting with abdominal pain and suspected internal herniation

Structured CT assessment aids in selecting patients for diagnostic laparoscopy, potentially reducing unnecessary surgeries.

Implement structured CT assessment protocols focusing on ten specific CT signs associated with internal herniation.
Provide brief targeted training for radiologists and registrars on CT signs to improve interobserver agreement.
Use a 5-point Likert scale to rate likelihood of internal herniation on CT scans for standardized reporting.
Ensure multidisciplinary collaboration between bariatric surgeons and radiologists for optimal diagnosis and management.

Clinical Scorecard: Effective Application of Computed Tomography for Diagnosing Internal Herniation Post-Roux-en-Y Gastric Bypass: A Proposal for Implementing a Radiological Prediction Score