Clinical Endoscopy

Original Article

The role of needle-based confocal laser endomicroscopy in the diagnosis of pancreatic neuroendocrine tumors: Masanori Yamada, Kazuo Hara, Nobumasa Mizuno, Shin Haba, Takamichi Kuwahara, Nozomi Okuno, Yasuhiro Kuraishi, Takafumi Yanaidani, Sho Ishikawa, Tsukasa Yasuda, Toshitaka Fukui; Clin Endosc 2024;57(3):393-401. Published online September 12, 2023; DOI: https://doi.org/10.5946/ce.2023.068

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Background
/Aims: Endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) is a highly accurate method for diagnosing pancreatic neuroendocrine tumors (PNETs); however, some PNETs are difficult to diagnose. Recently, the efficacy of needle-based confocal laser endomicroscopy (nCLE) in diagnosing solid pancreatic masses has been reported. However, the efficacy of nCLE in the diagnosis of PNETs remains unknown and only a small number of cases have been reported. Hence, this study aimed to evaluate the efficacy of nCLE in the diagnosis of PNETs.
Methods
This single-center retrospective study evaluated 30 consecutive patients with suspected PNETs on contrast-enhanced computed tomography, who consented to nCLE combined with EUS-FNA and were diagnosed using EUS-FNA or surgical resection. The diagnostic criteria for PNETs using nCLE were based on the nesting and trabecular and glandular arrangement of tumor cell clusters surrounded by capillary vessels and fibrosis, as reported in previous studies.
Results
The diagnosis using nCLE was classified into three categories: misdiagnosis in three cases (10%), non-diagnostic in six cases (20%), and diagnostic in 21 cases (70%). nCLE was able to diagnose PNET in one of the two cases with inconclusive EUS-FNA.
Conclusions
Although further development of the resolution and optimization of the diagnostic criteria are required, nCLE may constitute a useful diagnostic option in cases of inconclusive EUS-FNA for PNETs.

Citations

Citations to this article as recorded by

Recent developments in the diagnosis of pancreatic neuroendocrine neoplasms
Anna Battistella, Matteo Tacelli, Paola Mapelli, Marco Schiavo Lena, Valentina Andreasi, Luana Genova, Francesca Muffatti, Francesco De Cobelli, Stefano Partelli, Massimo Falconi
Expert Review of Gastroenterology & Hepatology.2024; 18(4-5): 155. CrossRef
Advancements and challenges in gastrointestinal imaging
Eun Jeong Gong, Chang Seok Bang
World Journal of Clinical Cases.2024; 12(33): 6591. CrossRef

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Reviews

Raman Spectroscopy for the Endoscopic Diagnosis of Esophageal, Gastric, and Colonic Diseases: Neel Sharma, Nobuyoshi Takeshita, Khek Yu Ho; Clin Endosc 2016;49(5):404-407. Published online September 22, 2016; DOI: https://doi.org/10.5946/ce.2016.100

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Globally white-light endoscopy with biopsy sampling is the gold standard diagnostic modality for esophageal, gastric, and colonic pathologies. However, there is overwhelming evidence to highlight the deficiencies of an approach based predominantly on eyeball visualization. Biopsy sampling is also problematic due in part to excessive sampling and hence attendant cost. Various innovations are currently taking place in the endoscopic domain to aid operators in diagnosis forming. These include narrow band imaging which aims to enhance the surface anatomy and vasculature, and confocal laser endomicroscopy which provides real time histological information. However, both of these tools are limited by the skill of the operator and the extensive learning curve associated with their use. There is a gap therefore for a new form of technology that relies solely on an objective measure of disease and reduces the need for biopsy sampling. Raman spectroscopy (RS) is a potential platform that aims to satisfy these criteria. It enables a fingerprint capture of tissue in relation to the protein, DNA, and lipid content. This focused review highlights the strong potential for the use of RS during endoscopic gastroenterological examination.

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A Review of Probe-Based Confocal Laser Endomicroscopy for Pancreaticobiliary Disease: Kunal Karia, Michel Kahaleh; Clin Endosc 2016;49(5):462-466. Published online September 19, 2016; DOI: https://doi.org/10.5946/ce.2016.086

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Confocal laser endomicroscopy (CLE) is a novel in vivo imaging technique that can provide real-time optical biopsies in the evaluation of pancreaticobiliary strictures and pancreatic cystic lesions (PCLs), both of which are plagued by low sensitivities of routine evaluation techniques. Compared to pathology alone, CLE is associated with a higher sensitivity and accuracy for the evaluation of indeterminate pancreaticobiliary strictures. CLE has the ability to determine the malignant potential of PCLs. As such, CLE can increase the diagnostic yield of endoscopic retrograde cholangiopancreatography and endoscopic ultrasound, reducing the need for repeat procedures. It has been shown to be safe, with an adverse event rate of ≤1%. Published literature regarding its cost-effectiveness is needed.

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Endoscopic Imaging in Barrett's Oesophagus: Applications in Routine Clinical Practice and Future Outlook: Sam Costello, Rajvinder Singh; Clin Endosc 2011;44(2):87-92. Published online December 31, 2011; DOI: https://doi.org/10.5946/ce.2011.44.2.87

Abstract PDF PubReader ePub

The practice for endoscopic surveillance of Barrett's oesophagus has evolved from "blind" or random 4 quadrant biopsies (Seattle protocol) to a more "intelligent" targeted biopsy approach. This evolution has been possible due to the rapid advances in endoscopic imaging technology and expertise in the last decade. Previous endoscopes had relatively poor image resolution that often did not allow the subtle mucosal changes associated with dysplastic Barrett's mucosa to be identified. Newer endoscopic imaging techniques available today may allow endoscopists to identify areas of dysplasia or malignancy and target biopsies accordingly. These modalities which include narrow band imaging, chromoendoscopy, autofluorescence imaging, and confocal endomicroscopy as well as a few novel imaging modalities on the horizon will be discussed further.

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