Related Experiment Video
Updated: May 28, 2026
Robotic Duodenum-preserving Total Pancreatic Head Resection for Intraductal Papillary Mucinous Neoplasms
Published on: April 17, 2026
The Efficacy of Contrast-Enhanced Endoscopic Ultrasound for Differentiating Mural Nodules from Mucus Clots in Branch
Naoki Mita1, Takuji Iwashita2,3, Yuki Utakata4
1Department of Gastroenterology, Gifu Prefectural General Medical Center, Gifu 500-8717, Japan.
Abstract:
Background/Objectives: The presence of a mural nodule (MN) is one of the findings indicating malignant transformation of an intraductal papillary mucinous neoplasm (IPMN). It is difficult to distinguish true MNs from mucus clots (MCs) by endoscopic ultrasound (EUS) alone. This study aimed to evaluate the efficacy of contrast-enhanced (CE)-EUS for differentiating true MNs from MCs and carcinoma from adenoma. Methods: A total of 104 patients who were diagnosed as having branch duct-type IPMNs with MN-like structures by EUS and underwent CE-EUS between January 2016 and August 2022 were included. MN-like structures without perfusion on CE-EUS were defined as MCs and those with perfusion were defined as true MNs. This was a retrospective study with limited pathological confirmation, and diagnoses in non-surgical cases were based on imaging and follow-up. Results: CE-EUS showed MN-like structures with perfusion in 35 patients and without perfusion in 69 patients. Surgical resection was eventually performed in a total of 28 patients and the diagnostic sensitivity, specificity and accuracy of MNs among them were 100%, 66.7% and 96.4% in CE-EUS; 48%, 66.7% and 50% in CE-CT; and 61.9%, 33.3% and 58.3% in MRCP, respectively. Possible risk factors indicating malignancy were statistically evaluated and presence of an MN was the only significant factor. Among the 35 true MNs, the height of an MN in carcinoma was significantly higher than that of an adenoma. The ROC analysis for detecting carcinoma in true MNs showed an area under the curve of 0.92 with the optimal cut-off value of 7 mm. When this cut-off value was used for diagnosing carcinoma, the sensitivity, specificity, and accuracy were 94.1%, 83.3% and 88.6%, respectively. Conclusions: CE-EUS may be useful for differentiating true MNs from MCs, although diagnostic performance should be interpreted cautiously because most non-surgical cases lacked pathological confirmation.
Insights
Contrast-enhanced endoscopic ultrasound (CE-EUS) effectively distinguishes true mural nodules (MNs) from mucus clots in intraductal papillary mucinous neoplasms (IPMNs). This imaging technique aids in differentiating adenoma from carcinoma, improving diagnostic accuracy for IPMN management.
Area of Science:
- Gastroenterology
- Medical Imaging
- Oncology
Background:
- Mural nodules (MNs) in intraductal papillary mucinous neoplasms (IPMNs) can indicate malignant transformation.
- Distinguishing true MNs from mucus clots (MCs) using standard endoscopic ultrasound (EUS) is challenging.
- Accurate differentiation is crucial for appropriate patient management and treatment decisions.
Purpose of the Study:
- To evaluate the efficacy of contrast-enhanced endoscopic ultrasound (CE-EUS) in differentiating true MNs from MCs.
- To assess CE-EUS's ability to differentiate between adenoma and carcinoma within IPMNs.
- To compare CE-EUS performance against CE-CT and MRCP for MN characterization.
Main Methods:
- Retrospective analysis of 104 patients with branch duct-type IPMNs and MN-like structures.
- Patients underwent CE-EUS between January 2016 and August 2022.
- True MNs were defined as perfused structures on CE-EUS; MCs were non-perfused.
Main Results:
- CE-EUS identified perfusion in 35 MN-like structures and no perfusion in 69.
- In surgically resected cases, CE-EUS showed 100% sensitivity and 96.4% accuracy for MN detection.
- A 7 mm MN height threshold on CE-EUS accurately predicted carcinoma with 94.1% sensitivity and 83.3% specificity.
Conclusions:
- CE-EUS is a valuable tool for differentiating true MNs from MCs in IPMNs.
- CE-EUS aids in distinguishing adenoma from carcinoma, particularly with a 7 mm height cutoff.
- Diagnostic performance requires cautious interpretation due to limited pathological confirmation in non-surgical cases.
Related Concept Videos
01:28Peptic Ulcer Disease III: Clinical Manifestations and Diagnostic Studies
Few clinical manifestations differentiate gastric ulcers from duodenal ulcers. Distinctions in the location, timing, and pain relief are crucial for healthcare providers in differentiating between gastric and duodenal ulcers during clinical assessments.
01:26Endoscopic Procedures V: ERCP
Patient...