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Background Narrow band imaging (NBI) is used in the detection of intestinal metaplasia (IM) and dysplasia in patients with Barrett's oesophagus (BE). Aims The study compared the usefulness of NBI with white-light standard endoscopy (WLSE) for the detection of dysplasia and IM in BE and determined the prediction of the histological diagnosis according to the mucosal and vascular patterns obtained by NBI. Patients and methods A total of 84 patients were prospectively enrolled in the study. Every patient underwent a WLSE with random biopsies and after 4–6 weeks, a NBI examination was performed. Results NBI detected significant more IM positive biopsies than WLSE (74.5% vs. 35.9%; p < 0.0001) and significant more patients with low grade dysplasia (LGD) (7.1% vs. 0%; p = 0.03). Taking biopsy samples from the villous pattern determined the diagnosis of IM (80%) and biopsies from the area covered by the irregular pattern lead to the identification of LGD in 45.4% of the cases and indefinite dysplasia (ID) in 18.2% of the cases. Conclusion A thorough analysis of NBI patterns may lead to real-time IM diagnosis in the absence of the histological examination and may require targeted biopsies from the areas with an irregular pattern for diagnosing dysplasia. [ABSTRACT FROM AUTHOR]

Background and Aim: Some studies suggest that narrow-band imaging (NBI) can be more accurate at diagnosing gastric intestinal metaplasia and dysplasia than white-light endoscopy (WLE) alone. We aimed to assess the real-time diagnostic validity of high resolution endoscopy with and without NBI in the diagnosis of gastric premalignant conditions and to derive a classification for endoscopic grading of gastric intestinal metaplasia (EGGIM).Methods: A multicenter prospective study (five centers: Portugal, Italy, Romania, UK, USA) was performed involving the systematic use of high resolution gastroscopes with image registry with and without NBI in a centralized informatics platform (available online). All users used the same NBI classification. Histologic result was considered the diagnostic gold standard.Results: A total of 238 patients and 1123 endoscopic biopsies were included. NBI globally increased diagnostic accuracy by 11 percentage points (NBI 94 % vs. WLE 83 %; P < 0.001) with no difference in the identification of Helicobacter pylori gastritis (73 % vs. 74 %). NBI increased sensitivity for the diagnosis of intestinal metaplasia significantly (87 % vs. 53 %; P < 0.001) and for the diagnosis of dysplasia (92 % vs. 74 %). The added benefit of NBI in terms of diagnostic accuracy was greater in OLGIM III/IV than in OLGIM I/II (25 percentage points vs. 15 percentage points, respectively; P < 0.001). The area under the curve (AUC) of the receiver operating characteristic (ROC) curve for EGGIM in the identification of extensive metaplasia was 0.98.Conclusions: In a real-time scenario, NBI demonstrates a high concordance with gastric histology, superior to WLE. Diagnostic accuracy higher than 90 % suggests that routine use of NBI allows targeted instead of random biopsy samples. EGGIM also permits immediate grading of intestinal metaplasia without biopsies and merits further investigation. [ABSTRACT FROM AUTHOR]

Neuroendocrine tumors (carcinoids) are tumors originating from neuroendocrine cells. The distinction between different types of gastric carcinoids is important for their management. We present the case of a 38-year old woman with type 1 gastric neuroendocrine tumors (NETs) associated with autoimmune atrophic gastritis. The management of these tumors has not been yet codified and different therapeutic strategies have been suggested. A proper evaluation before therapy is indicated in order to rule out both the malignant transformation as well as the presence of synchronous lesions, such as dysplasia or gastric adenocarcinoma. We describe our diagnostic and therapeutic strategies with references to previously published reports. [ABSTRACT FROM AUTHOR]

Introduction: Early diagnosis of gastric neoplasia involves both the detection and surveillance of patients with premalignant gastric lesions. Magnifying endoscopy allows the analysis of the fine mucosal structure and microvascular architecture. Material and methods: The aim of our study is to identify specific patterns associated with premalignant gastric lesions by magnifying endoscopy in conjunction with chromoscopy. We performed conventional upper endoscopies and we selected a number of patients for chromodiagnostic and magnification. We classified the endoscopic patterns in normal and abnormal (modified) patterns. Target biopsies were obtained from magnified areas and we analyzed the correspondence with the histological findings. Results: We identified specific pit patterns for normal gastric mucosa and for inflamed mucosa. A tubular pattern was associated with the detection of intestinal metaplasia. An irregular pattern and abnormal microvessels were endoscopic findings associated with the detection of high-grade dysplasia. An irregular form of collecting venules was detected in areas with atrophic gastritis. Conclusions: An initial selection of patients based on conventional endoscopic findings is mandatory. Gastric mucosal changes identified by magnifying endoscopy raise the number of detected premalignant lesions by targeted biopsies. Our work emphasizes the current challenges related to the use of these endoscopic methods. [ABSTRACT FROM AUTHOR]

Introduction: the detection of gastric preneoplastic lesions (atrophic gastritis, intestinal metaplasia, dysplasia) is important regarding the patient's risk evaluation for gastric cancer. The purpose of this study consists in the pit pattern evaluation, specific to the 3 premalignant lesions by magnifying endoscopy and chromeondoscopy. Material and methods: The study has started in January 2010 and it is still in progress. The patients have been examined by conventional endoscopy, respectively selected for magnifying endoscopy and chromoendoscopy. Partial results: I have obtained pit patterns specific to gastric mucosa in precancerous lesions. Partial conclusions: 1. Several pit patterns can be identified in the same patient. 2. The stomach can be mapped more exactly, this way being identified the area of modified mucosa; thus target biopsies can be done raising the chances for an accurate diagnosis. 3. It is a resource and time-consuming method. [ABSTRACT FROM AUTHOR]

The diagnosis of dysplasia and early neoplasia in Barrett's esophagus by conventional endoscopy is based on a four- quadrant random biopsies protocol that is prone to sampling errors. Novel endoscopic techniques have been developed to enhance the detection of premalignant and malignant lesions by real time assessment of microvasculare architecture and mucosal structure. Chromoendoscopy with magnification has improved the visualization of lesions, but the dye application impairs a clear evaluation of vascular network. Narrow band imaging endoscopy enhances vascular imaging by using narrow bandwidth lights, with penetration to superficial mucosal structures. Different classification systems of mucosal and vascular patterns have been developed to improve the diagnostic accuracy of non-dysplastic and dysplastic BE, as well as of early esophageal cancer. This article is focused on both the clinical benefits and controversies surrounding conventional and advanced endoscopic methods used for screening and surveillance of patients with Barrett's esophagus. Current evidence shows that the adoption of new technology in routine practice requires a high level of performance as well as the standardization of various classification systems. [ABSTRACT FROM AUTHOR]

Background: Often early gastric cancer (EGC) is asymptomatic, that is why most of the patients come for medical investigation already ill with advanced gastric cancer. The detection of premalignant gastric lesions and their control, help the exposure of gastric cancer in its initial stage and implicitly to a prompter access to the appropriate treatment for the patients. This study quantifies the utility of narrow band imaging-endoscopy (NBI) for the detection of premalignant lesions and early gastric cancer. Material and methods: This prospective study included 63 patients. They underwent an examination with white light endoscopy (WLE) and Sidney system of biopsy followed by magnifying NBI with targeted biopsies. We monitored the presence of EGC, dysplasia (Dis), intestinal metaplasia (IM). Results: IM was diagnosed in 60 patients, and 128 areas. Dis was detected in 11 patients and 13 areas and 2 patients had EGC. The premalignant gastric lesions were detected by both investigation methods. We followed sensibility, specificity, positive, negative predictive values. For NBI we obtained 81%, 75%, and for WLE 52%, 68%. The EGC was diagnosed only with NBI. Conclusions: NBI endoscopy is better than WLE for detected IM, Dis and EGC. This method can be used for screening EGC. [ABSTRACT FROM AUTHOR]