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Recent updates on the endoscopic treatment of rectal neuroendocrine tumor
Sunghyeok Ryou, Kwangwoo Nam
Received July 18, 2025  Accepted September 8, 2025  Published online November 27, 2025  
DOI: https://doi.org/10.5217/ir.2025.00141    [Epub ahead of print]
AbstractAbstract PDFPubReaderePub
The incidence of rectal neuroendocrine tumors has been gradually increasing, primarily due to the widespread use of screening colonoscopy and growing awareness of the disease. Most rectal neuroendocrine tumors are small ( < 10 mm), well-differentiated, and low-grade lesions at the time of diagnosis, and they are usually asymptomatic. Given these characteristics, endoscopic resection is considered a feasible treatment option for early-stage lesions. However, due to their inherent malignant potential, a comprehensive initial diagnostic evaluation is essential. Lymph node or distal metastasis can be present at diagnosis or may develop long after apparently successful primary treatment. Therefore, achieving complete resection using the most optimal resection method is crucial. Modified endoscopic mucosal resection and endoscopic submucosal dissection are recommended over conventional forceps or snare polypectomy, which are associated with high incomplete resection rates. In case of incomplete resection, additional endoscopic resection can be a feasible option in selected cases. Furthermore, regular post-resection surveillance is needed, especially in patients with high-risk of recurrence such as poor pathologic result or incomplete resection.

Citations

Citations to this article as recorded by  
  • Endoscopic Resection of Rectal Neuroendocrine Tumors: Pathologic Risk Stratification and Surveillance Strategies
    Ji Eun Kim
    Journal of Digestive Cancer Research.2025; 13(3): 228.     CrossRef
  • 620 View
  • 88 Download
  • 1 Crossref
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Systematic Review
Accuracy of computed tomographic features in differentiating intestinal tuberculosis from Crohn's disease: a systematic review with meta-analysis
Saurabh Kedia, Raju Sharma, Vishnubhatla Sreenivas, Kumble Seetharama Madhusudhan, Vishal Sharma, Sawan Bopanna, Venigalla Pratap Mouli, Rajan Dhingra, Dawesh Prakash Yadav, Govind Makharia, Vineet Ahuja
Intest Res 2017;15(2):149-159.   Published online April 27, 2017
DOI: https://doi.org/10.5217/ir.2017.15.2.149
AbstractAbstract PDFPubReaderePub

Abdominal computed tomography (CT) can noninvasively image the entire gastrointestinal tract and assess extraintestinal features that are important in differentiating Crohn's disease (CD) and intestinal tuberculosis (ITB). The present meta-analysis pooled the results of all studies on the role of CT abdomen in differentiating between CD and ITB. We searched PubMed and Embase for all publications in English that analyzed the features differentiating between CD and ITB on abdominal CT. The features included comb sign, necrotic lymph nodes, asymmetric bowel wall thickening, skip lesions, fibrofatty proliferation, mural stratification, ileocaecal area, long segment, and left colonic involvements. Sensitivity, specificity, positive and negative likelihood ratios, and diagnostic odds ratio (DOR) were calculated for all the features. Symmetric receiver operating characteristic curve was plotted for features present in >3 studies. Heterogeneity and publication bias was assessed and sensitivity analysis was performed by excluding studies that compared features on conventional abdominal CT instead of CT enterography (CTE). We included 6 studies (4 CTE, 1 conventional abdominal CT, and 1 CTE+conventional abdominal CT) involving 417 and 195 patients with CD and ITB, respectively. Necrotic lymph nodes had the highest diagnostic accuracy (sensitivity, 23%; specificity, 100%; DOR, 30.2) for ITB diagnosis, and comb sign (sensitivity, 82%; specificity, 81%; DOR, 21.5) followed by skip lesions (sensitivity, 86%; specificity, 74%; DOR, 16.5) had the highest diagnostic accuracy for CD diagnosis. On sensitivity analysis, the diagnostic accuracy of other features excluding asymmetric bowel wall thickening remained similar. Necrotic lymph nodes and comb sign on abdominal CT had the best diagnostic accuracy in differentiating CD and ITB.

Citations

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    Indian Journal of Gastroenterology.2025;[Epub]     CrossRef
  • DIAGNOSTIC IMAGING IN CROHN'S DISEASE
    G.M. ZHARGALOVA, P.V. SELIVERSTOV
    AVICENNA BULLETIN.2025; 27(2): 441.     CrossRef
  • Navigating the Differential Diagnosis of Intestinal Tuberculosis and Crohn's Disease
    Venigalla Pratap Mouli, Saurabh Kedia, Vishal Sharma, Anna Benjamin Pulimood, Raju Sharma, Vineet Ahuja
    Gastroenterology.2025; 169(6): 1139.     CrossRef
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    M. Huang, L. Tu, J. Li, X. Yue, L. Wu, M. Yang, Y. Chen, P. Han, X. Li, L. Zhu
    Clinical Radiology.2024; 79(3): e482.     CrossRef
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    Ming Cheng, Hanyue Zhang, Wenpeng Huang, Fei Li, Jianbo Gao
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    Himanshu Narang, Saurabh Kedia, Vineet Ahuja
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    Journal of Gastroenterology and Hepatology.2023; 38(4): 510.     CrossRef
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    A. V. Vardanyan, E. S. Merkulova, V. A. Belinskaya, K. S. Frolova, O. A. Mainovskaya
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    Indian Journal of Gastroenterology.2023; 42(1): 17.     CrossRef
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    BMC Gastroenterology.2023;[Epub]     CrossRef
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    Preeti Mor, Bhawna Dahiya, Sanjeev Parshad, Pooja Gulati, Promod K. Mehta
    Expert Review of Gastroenterology & Hepatology.2022; 16(1): 33.     CrossRef
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    Intestinal Research.2022; 20(2): 184.     CrossRef
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    Journal of Gastroenterology and Hepatology.2021; 36(8): 2141.     CrossRef
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Case Report
Natural Course of an Untreated Metastatic Perirectal Lymph Node After the Endoscopic Resection of a Rectal Neuroendocrine Tumor
Sang Hyung Kim, Dong-Hoon Yang, Jung Su Lee, Soyoung Park, Ho-Su Lee, Hyojeong Lee, Sang Hyoung Park, Kyung-Jo Kim, Byong Duk Ye, Jeong-Sik Byeon, Seung-Jae Myung, Suk-Kyun Yang, Jin-Ho Kim, Chan Wook Kim, Jihun Kim
Intest Res 2015;13(2):175-179.   Published online April 27, 2015
DOI: https://doi.org/10.5217/ir.2015.13.2.175
AbstractAbstract PDFPubReader

Lymph node metastasis is rare in small (i.e., <10 mm) rectal neuroendocrine tumors (NETs). In addition to tumor size, pathological features such as the mitotic or Ki-67 proliferation index are associated with lymph node metastasis in rectal NETs. We recently treated a patient who underwent endoscopic treatment of a small, grade 1 rectal NET that recurred in the form of perirectal lymph node metastasis 7 years later. A 7-mm-sized perirectal lymph node was noted at the time of the initial endoscopic treatment. The same lymph node was found to be slightly enlarged on follow-up and finally confirmed as a metastatic NET. Therefore, the perirectal lymph node metastasis might have been present at the time of the initial diagnosis. However, the growth rate of the lymph node was extremely low, and it took 7 years to increase in size from 7 to 10 mm. NETs with low Ki-67 proliferation index and without mitotic activity may grow extremely slowly even if they are metastatic.

Citations

Citations to this article as recorded by  
  • Current status of endoscopic resection for small rectal neuroendocrine tumors
    Jian-Ning Liu, Hui Chen, Nian Fang
    World Journal of Gastroenterology.2025;[Epub]     CrossRef
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    Soo-Young Na, Seong Jung Kim, Hyoun Woo Kang
    International Journal of Gastrointestinal Intervention.2023; 12(3): 105.     CrossRef
  • Tumor grade 2 as the independent predictor for lymph node metastasis in 10–20 mm sized rectal neuroendocrine tumor
    Byung-Soo Park, Sung Hwan Cho, Gyung Mo Son, Hyun Sung Kim, Su Jin Kim, Su Bum Park, Cheol Woong Choi, Hyung Wook Kim, Dong Hoon Shin
    Korean Journal of Clinical Oncology.2021; 17(1): 37.     CrossRef
  • Lymphovascular invasion as a prognostic value in small rectal neuroendocrine tumor treated by local excision: A systematic review and meta-analysis
    Ho Suk Kang, Mi Jung Kwon, Tae-Hwan Kim, Junhee Han, Young-Su Ju
    Pathology - Research and Practice.2019; 215(11): 152642.     CrossRef
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  • 9,264 View
  • 57 Download
  • 11 Web of Science
  • 9 Crossref
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