No abstract available.
Narrow Band Imaging*

No abstract available.
Narrow Band Imaging* ; Polyps*

Virtual chromoscopy is a novel technology that enhances endoscopic visualization of superficial mucosal surfaces and microvascular architecture. Currently available virtual chromoscopy techniques include narrow band imaging, Fujinon intelligent color enhancement and I-scan. Refinements are expected to improve detection of the lesions, which will lead to further insight into the pathological processes, in turn, providing guidance in selecting the optimal treatment. Presently, we review the currently available literature regarding virtual chromoscopy and provide technical principles, clinical usefulness, and limitations.
Narrow Band Imaging ; Pathologic Processes

The recent advances in endoscopic imaging technologies make great changes in the management of colorectal polyps. These changes include optical histologic diagnosis with high definition colonscopy, new management strategies such as resect and discard or do not resect, and differentiation of depth of submucosal invasion. In this focused review series, these new paradigms in management of colorectal polyps are discussed by three, world famous authors. First, Amit Rastogi explained optical diagnosis of small colorectal polyp with high definition colonoscopy using narrow band imaging. Second, Cesare Hassan explained new paradigms for colonoscopic management of diminutive colorectal polyps: resect and discard or do not resect. In the last, Shinji Tanaka described, in detail, endoscopic assessment of invasive colorectal cancer: slight vs. deep submucosal invasion. These focused review series introduce the new roles of current colonoscopy to readers and will help the readers to know how to use the new imaging technologies and paradigms in clinical practices.
Colonoscopy ; Narrow Band Imaging ; Polyps

No abstract available.
Colorectal Neoplasms ; Endoscopy ; Narrow Band Imaging

BACKGROUND/AIMS: Narrow band imaging (NBI) is a new technique that is expected to improve the detection rate of colorectal polyps, but results have been inconsistent. The aim of this study was to compare the polyp miss rate and the characteristics of missed colorectal polyps using white light (WL) and NBI. METHODS: 62 patients were randomized into two groups. In the first group (NBI first, NBIF), a colonoscopic examination of each segment (cecum-ascending, transverse, descending, and rectosigmoid colons) was performed first with NBI followed by a re-examination of the same segment using WL. An opposite sequence was applied for the other group (white light first, WLF). RESULTS: 67 polyps were found in the first examination, and 31 polyps were found on the re-examination, resulting in a polyp miss rate of 31.6%. The polyp miss rate was 39% for WLF and 23% for NBIF (p>0.05). Seventy-four small polyps (<5 mm) were found, and miss rates for NBIF and WLF were 20% and 46%, respectively (p=0.01). The polyp miss rate at the rectosigmoid was 11% for NBIF and 54% for WLF (p=0.01). CONCLUSIONS: The polyp miss rate was not significantly different between NBI or WL when a colonoscopy was performed. NBI resulted in a lower polyp miss rate for small (<5 mm) and rectosigmoid polyps than WL.
Colonoscopy ; Humans ; Light ; Narrow Band Imaging ; Polyps

To improve the detection rate of gastrointestinal tumors, image-enhanced endoscopy has been widely used during screening and surveillance endoscopy in Korea. In addition to narrow band imaging (NBI) with/without magnification, various types of electronic chromoendoscopies have been used, including autofluorescence imaging, I-scan, and flexible spectral imaging color enhancement. These technologies enable the accurate characterization of tumors because they enable visualization of microvascular and microsurface patterns. The present review focuses on understanding the principle and clinical applications of advanced imaging technologies other than NBI.
Endoscopy ; Korea ; Mass Screening ; Narrow Band Imaging* ; Optical Imaging

Recently, several new endoscopic imaging techniques have been developed, including endoscopic ultrasonography, narrow band imaging, autofluorescence imaging, and confocal laser endomicroscopy. Preliminary studies have reported promising results in diagnosing gastric cancer with these new endoscopic imaging techniques. For wider clinical application, however, more evidence is required to show the clinical efficacy of these advanced endoscopic techniques in the diagnosis of gastric cancer. For the treatment of early gastric cancer, endoscopic submucosal dissection methods have recently been developed. Endoscopic submucosal dissection enables en bloc resection of large lesions and lesions with accompanying ulcerations, as the lesion is directly dissected along the submucosal layer using a high-frequency electrosurgical knife. With the development of the endoscopic submucosal dissection technique and the accumulation of long-term outcome data, the applications for endoscopic resection for early gastric cancer are expanding.
Diagnosis* ; Endosonography ; Narrow Band Imaging ; Optical Imaging ; Stomach Neoplasms* ; Ulcer

Recently, several new endoscopic imaging techniques have been developed, including endoscopic ultrasonography, narrow band imaging, autofluorescence imaging, and confocal laser endomicroscopy. Preliminary studies have reported promising results in diagnosing gastric cancer with these new endoscopic imaging techniques. For wider clinical application, however, more evidence is required to show the clinical efficacy of these advanced endoscopic techniques in the diagnosis of gastric cancer. For the treatment of early gastric cancer, endoscopic submucosal dissection methods have recently been developed. Endoscopic submucosal dissection enables en bloc resection of large lesions and lesions with accompanying ulcerations, as the lesion is directly dissected along the submucosal layer using a high-frequency electrosurgical knife. With the development of the endoscopic submucosal dissection technique and the accumulation of long-term outcome data, the applications for endoscopic resection for early gastric cancer are expanding.
Diagnosis* ; Endosonography ; Narrow Band Imaging ; Optical Imaging ; Stomach Neoplasms* ; Ulcer

The possibility to predict in vivo the histology of colorectal polyps by advanced endoscopic imaging has resulted in the implementation of a more conservative management for diminutive lesions detected at colonoscopy. In detail, a predict-and-do-not-resect strategy has been proposed for diminutive lesions located in the rectosigmoid tract, whilst a predict-resect-and-discard policy has been advocated for nonrectosigmoid diminutive polyps. Recently, the American Society for Gastrointestinal Endoscopy set required thresholds to be met, before allowing the adoption of these policies in the clinical field. The ability of current endoscopic imaging in reaching these thresholds would depend on a complex interaction among the accuracy of advanced endoscopic imaging in differentiating between adenomatous and hyperplastic lesions, the prevalence of (advanced) neoplasia within diminutive lesions, and the type of surveillance intervals recommended. Aim of this review is to summarize the data supporting the application of both a predict-and-do-not-resect and a predict-resect-and-discard policies, also addressing the potential pitfalls associated with these strategies.
Adoption ; Colonoscopy ; Endoscopy, Gastrointestinal ; Narrow Band Imaging ; Polyps ; Prevalence