内镜窄带成像与染色技术诊断大肠肿瘤的对比研究

目的通过窄带成像技术（NBI）和染色放大方法对大肠新生性病变进行观察，比较这两种技术对大肠肿瘤及非肿瘤性病变的鉴别诊断精度差异。方法2006年6月至9月间，共302例年龄在加至80岁之间的患者进行了NBI肠镜检查，其中98例入选。内镜插入至回盲部，退镜时分别采用常规模式、NBI模式观察，发现病变后，分别用NBI模式及染色放大方法进行血管分型及腺管开口分型，然后行病理检查进行评价比较。结果在98例患者发现新生性病变147个，其中常规内镜下发现的病变有90．5％（133／147），采用NBI发现病变有98．6％（145／147），差异有统计学意义（P〈0．01），漏诊的主要为平坦型病变。NBI观察对肿瘤性或非肿瘤的判断符合率为91．8％，染色内镜为82．3％（P〈0.01）。结论NBI技术观察黏膜表面变化，判断肿瘤或非肿瘤病变的符合率比普通内镜和染色内镜高，敏感性强；操作转换简单易行，尤其有利于平坦型病变的发现及诊断。     

Computed virtual chromoendoscopy for classification of small colorectal lesions: a prospective comparative study

OBJECTIVES: Standard colonoscopy offers no reliable discrimination between neoplastic and nonneoplastic colorectal lesions. Computed virtual chromoendoscopy with the Fujinon intelligent color enhancement (FICE) system is a new dyeless imaging technique that enhances mucosal and vascular patterns. This prospective trial compared the feasibility of FICE, standard colonoscopy, and conventional chromoendoscopy with indigo carmine in low- and high-magnification modes for determination of colonic lesion histology. METHODS: Sixty-three patients with 150 flat or sessile lesions less than 20 mm in diameter were enrolled. At colonoscopy, each lesion was observed with six different endoscopic modalities: standard colonoscopy, FICE, and conventional chromoendoscopy with indigo carmine (0.2%) dye spraying in both low- and high-magnification modes. Histopathology of all lesions was confirmed by evaluation of endoscopic resection or biopsy specimens. Endoscopic images were stored electronically and randomly allocated to a blinded reader. RESULTS: Of the 150 polyps, 89 were adenomas and 61 were hyperplastic polyps with an average size of 7 mm. For identifying adenomas, the FICE system with low and high magnifications revealed a sensitivity of 89.9% and 96.6%, specificity of 73.8% and 80.3%, and diagnostic accuracy of 83% and 90%, respectively. Compared with standard colonoscopy, the sensitivity and diagnostic accuracy achieved by FICE were significantly better under both low (P < 0.02) and high (P < 0.03) magnification and were comparable to that of conventional chromoendoscopy. CONCLUSIONS: The FICE system identified morphological details that efficiently predict adenomatous histology. For distinguishing neoplastic from nonneoplastic lesions, FICE was superior to standard colonoscopy and equivalent to conventional chromoendoscopy.     

Comparative study of conventional colonoscopy, chromoendoscopy, and narrow-band imaging systems in differential diagnosis of neoplastic and nonneoplastic colonic polyps

AIM: To identify the feasibility of the narrow-band imaging (NBI) method compared with that of conventional colonoscopy and chromoendoscopy for distinguishing neoplastic and nonneoplastic colonic polyps. METHOD: This study enrolled consecutive patients who underwent colonoscopy using a conventional colonoscope between January and February 2006 at Chang-Gung Memorial Hospital, Linkou Medical Center, Taiwan. These 78 patients had 110 colorectal polyps. During the procedure, conventional colonoscopy first detected lesions, and then the NBI system was used to examine the capillary networks. Thereafter indigo carmine (0.2%) was sprayed directly on the mucosa surface prior to evaluating the crypts using a conventional colonoscope. The pit patterns were characterized using the classification system proposed by Kudo. Finally, a polypectomy or biopsy was performed for histological diagnosis. RESULTS: Of the 110 colorectal polyps, 65 were adenomas, 40 were hyperplastic polyps, and five were adenocarcinomas. The NBI system and pit patterns for all lesions were analyzed. For differential diagnosis of neoplastic (adenoma and adenocarcinoma) and nonneoplastic (hyperplastic) polyps, the sensitivity of the conventional colonoscope for detecting neoplastic polyps was 82.9%, specificity was 80.0% and diagnostic accuracy was 81.8%, significantly lower than those achieved with the NBI system (sensitivity 95.7%, specificity 87.5%, accuracy 92.7%) and chromoendoscopy (sensitivity 95.7%, specificity 87.5%, accuracy 92.7%). Therefore, no significant difference existed between the NBI system and chromoendoscopy during differential diagnosis of neoplastic and nonneoplastic polyps. CONCLUSION: The NBI system identified morphological details that correlate well with polyp histology by chromoendoscopy.     

Conventional colonoscopy and magnified chromoendoscopy for the endoscopic histological prediction of diminutive colorectal polyps： A single operator study

AIM: To accurately differentiate the adenomatous from the non-adenomatous polyps by colonoscopy. METHODS: All lesions detected by colonoscopy were first diagnosed using the conventional view followed by chromoendoscopy with magnification. The diagnosis at each step was recorded consecutively. All polyps were completely removed endoscopically for histological evaluation. The accuracy rate of each type of endoscopic diagnosis was evaluated, using histological findings as gold standard. RESULTS: A total of 240 lesions were identified, of which 158 (65.8%) were non-neoplastic and 82 (34.2%) were adenomatous. The overall diagnostic accuracy of conventional view, and chromoendoscopy with magnification was 76.3% (183/240) and 95.4% (229/240), respectively (P< 0.001) CONCLUSION: The combination of colonoscopy and magnified chromoendoscopy is the most reliable non-biopsy method for distinguishing the non-neoplastic from the neoplastic lesions.     

窄带成像技术普通内镜与放大内镜对大肠肿瘤诊断价值的对比研究

目的 探讨窄带成像技术（NBI）模式下普通内镜和放大内镜对大肠肿瘤性与非肿瘤性病变的鉴别诊断价值.方法 选择2008年9月至2010年2月间内镜中心行NBI内镜检查发现的大肠新生性病变的患者,对发现的大肠新生性病变进行黏膜表面细微腺管开口形态分型及微血管形态分型,综合工藤进英腺管开口形态分型法与佐野宁微血管形态分型法进行诊断,将NBI内镜诊断结果与病理诊断结果进行对比分析.100例患者符合条件纳入研究,其中行NBI普通内镜64例,行NBI放大内镜36例.结果 排除不符合诊断标准的7例病例（NBI普通内镜5例,NBI放大内镜2例）,NBI内镜对大肠肿瘤性与非肿瘤性病变诊断的总符合率为91.4%（85/93）,其中NBI普通内镜为89.8%（53/59）,NBI放大内镜为94.1%（32/34）,均明显高于文献报道传统内镜的79.1%（P均＜0.05）,但NBI普通内镜与NBI放大内镜间比较差异无统计学意义（P＞0.05）.结论 与NBI放大内镜相似,NBI普通内镜也可比较准确地鉴别大肠肿瘤性与非肿瘤性病变.     

高清不放大窄带成像内镜对大肠隆起性病变的鉴别诊断作用

目的评价窄带成像技术(NBI)普通内镜在大肠隆起样病变诊断中价值。方法应用NBI普通内镜观察了80例患者共103个大肠隆起样病变的表面腺管开口形态。根据工藤进英腺管开口形态分型法,将NBI内镜诊断结果与病理检查结果进行比较。结果普通肠镜发现隆起样病变的敏感性为80.0%(80/103),切换NBI后,能清楚显示隆起样病变的形态和边界,发现隆起样病变的敏感性为100%(103/103);NBI普通内镜观察隆起样病变腺管开口,根据工藤进英腺管开口形态分型法进行诊断,其中腺管开口呈Ⅱ型18例,Ⅲ(L)型54例,Ⅳ型15例,Ⅴ型16例。NBI普通内镜对于大肠隆起性病变肿瘤及非肿瘤性的鉴别诊断的敏感性、特异性分别为95.3%(81/85)、83.3%(15/18)、NBI普通内镜对于大肠隆起性病变肿瘤及非肿瘤性的鉴别诊断的符合率为93.2%(96/103),与文献报道的NBI放大内镜的94.1%无统计学差异(P0.05)。结论应用NBI普通内镜,也可以通过观察腺管开口形态,比较准确地鉴别诊断大肠肿瘤与非肿瘤病变。     

窄带成像技术在大肠肿瘤性病变与非肿瘤性病变的鉴别诊断中的价值

目的探讨窄带成像技术(narrow band imaging,NBI)在大肠肿瘤性病变与非肿瘤性病变的鉴别诊断中的价值。方法收集2010年1月-2013年10月在梧州红十字会医院内镜室进行结肠镜检查的患者98例,通过普通肠镜、NBI检查结果与病理学检查结果进行对比分析,鉴别诊断大肠肿瘤性病变与非肿瘤性病变。结果 98例患者中共发现136个病变。普通内镜诊断肿瘤性病变的敏感性、特异性及准确性分别为75.5%、78.6%及76.5%;NBI诊断肿瘤性病变的敏感性、特异性及准确性分别为95.7%、95.2%及95.6%,后者明显高于前者,差异有统计学意义(P0.01)。病变轮廓、pit及CP显示清晰度比较,NBI明显优于普通内镜,差异均有统计学意义(P0.01)。结论相对于普通内镜,NBI内镜能更清晰地显示病变的轮廓、腺管开口的分型及微血管的形态,在大肠肿瘤性病变与非肿瘤性病变的鉴别诊断中有重要价值。     

Magnifying endoscopy with narrow band imaging for diagnosis of colorectal tumors

BACKGROUND: Narrow band imaging (NBI) uses optical filters for red-green-blue sequential illumination and narrows the bandwidth of spectral transmittance. OBJECTIVE: This study aimed to clarify the clinical usefulness of NBI magnification in assessment of pit patterns for diagnosis of colorectal tumors. DESIGN: This was a retrospective study. SETTING: Department of Endoscopy, Hiroshima University Hospital. PATIENTS AND MAIN OUTCOME MEASUREMENTS: A total of 148 colorectal lesions, 16 hyperplasias, 84 tubular adenomas, and 48 early carcinomas were examined and diagnosed histologically. Mean size of lesions was 15.6+/-7.28 mm. Lesions were observed first under NBI magnification without chromoendoscopy and then under standard magnification with chromoendoscopy, and pit patterns were recorded. Results of NBI magnification were compared with those of standard magnification with chromoendoscopy to assess the clinical usefulness of NBI magnification for diagnosing colorectal neoplasia. RESULTS: Correspondence between the two diagnostic methods was 88% (14/16) for type II, 100% (2/2) for type IIIs, 98% (73/75) for type IIIl, 88% (7/8) for type IV, 78% (25/32) for type Vi, and 100% (3/3) for type Vn pit patterns. NBI depicted brownish change on the basis of surface capillaries in 6% (1/16) of hyperplasia and 99% (83/84) of tubular adenomas. This difference in color depiction was significant. LIMITATIONS: This study was performed in single center. CONCLUSIONS: Determination of pit patterns of colorectal neoplasias by NBI magnification was nearly the same as that by standard magnification with chromoendoscopy. Furthermore, NBI can distinguish neoplastic and nonneoplastic lesions without chromoendoscopy.     

窄带成像技术在结直肠肿瘤性与非肿瘤性病变诊断中的临床应用价值

目的探讨内镜窄带成像技术(NBI)在结直肠肿瘤性及非肿瘤性病变诊断中的临床价值.方法选择2010年2月至2011年3月常规结肠镜检查发现的结直肠肿瘤性与非肿瘤性病变75个(60例).发现病变后分别采用常规模式、NBI模式及染色方法对病变轮廓、黏膜表面腺管开口(PIT)及微血管(CP)形态进行观察,与病理检查结果进行对比...     

Efficacy of magnifying chromoendoscopy for the differential diagnosis of colorectal lesions

Magnifying chromoendoscopy is an exciting new tool and offers detailed analysis of the morphological architecture of mucosal crypt orifices. In this review, we principally show the efficacy of magnifying chromoendoscopy for the differential diagnosis of colorectal lesions such as prediction between non‐neoplastic lesions and neoplastic ones, and distinction between endoscopically treatable early invasive cancers and untreatable cancers based on a review of the literature and our experience at two National Cancer Centers in Japan. Overall diagnostic accuracy by conventional view, chromoendoscopy and chromoendoscopy with magnification ranged from 68% to 83%, 82% to 92%, and 80% to 96%, respectively, and diagnostic accuracy of accessing the stage of early colorectal cancer using magnifying colonoscopy was over 85%. Although the reliability depends on the skill in magnifying observation, widespread applications of the magnification technique could influence the indications for biopsy sampling during colonoscopy and the indication for mucosectomy. Moreover, the new detailed images seen with magnifying chromoendoscopy are the beginning of a new period in which new optical developments, such as narrow band imaging system, endocytoscopy system, and laser‐scanning confocal microscopy, will allow a unique look at glandular and cellular structures.     

MAGNIFYING OBSERVATION OF MICROVASCULAR ARCHITECTURE OF COLORECTAL LESIONS USING A NARROW‐BAND IMAGING SYSTEM

We reviewed the magnifying observation of the microvascular architecture of colorectal lesions and discuss the utility of the detailed observation of the microvascular architecture for differential diagnosis during narrow‐band imaging (NBI) colonoscopy. Angiogenesis is critical to the transition of premalignant lesions in a hyperproliferative state to the malignant phenotype. Therefore, diagnosis based on angiogenic or vascular morphologic changes might be ideal for early detection or diagnosis of neoplasms. In this review, we propose the term ‘meshed capillary’ for the distinction between non‐neoplastic and neoplastic lesions and the capillary classification ‘capillary pattern’ for the differential diagnosis of colorectal lesions. We believe that the combined use of NBI optical chromoendoscopy and real chromoendoscopy decreases the time and cost of screening colonoscopy. To assess the feasibility and efficacy of using the NBI system, further studies are required for colorectal lesions and other lesions of the gastrointestinal tract.     

窄带成像结肠镜对结肠息肉样病变的诊断价值

探讨窄带成像（NBI）结肠镜对结肠息肉样病变的病理组织类型的预测能力.方法 125例患者接受结肠镜检查诊断结肠息肉样病变173个,根据腺管开口形态及NBI下血管分型判定该病变为肿瘤性病变（结肠腺瘤、结肠癌）或非肿瘤性病变,并与病理结果对照,判定各种方法的敏感性、特异性及准确率.结果 NBI下血管形态鉴别肿瘤性或非肿瘤性病变的敏感性、特异性及准确率（94.83%、91.23%、93.64%）以及隐窝形态结合血管形态鉴别肿瘤性或非肿瘤性病变的敏感性、特异性及准确率（95.69%、96.49%、95.59%）显著高于常规内镜（80.17%、84.21%、81.50%）（P〈0.05）.血管形态鉴别腺瘤与结肠癌的敏感性、特异性、准确率为86.90%、100.00%、87.93%.结论 NBI模式下结肠镜检查对息肉样病变的肿瘤性、非肿瘤性,结肠腺瘤、结肠癌的鉴别优于常规内镜检查,接近病理学检查.     

Quest for the best endoscopic imaging modality for computer-assisted colonic polyp staging

BACKGROUND It was shown in previous studies that high definition endoscopy, high magnification endoscopy and image enhancement technologies, such as chromoendoscopy and digital chromoendoscopy [narrow-band imaging(NBI), iScan] facilitate the detection and classification of colonic polyps during endoscopic sessions. However, there are no comprehensive studies so far that analyze which endoscopic imaging modalities facilitate the automated classification of colonic polyps. In this work, we investigate the impact of endoscopic imaging modalities on the results of computer-assisted diagnosis systems for colonic polyp staging.AIM To assess which endoscopic imaging modalities are best suited for the computerassisted staging of colonic polyps.METHODS In our experiments, we apply twelve state-of-the-art feature extraction methods for the classification of colonic polyps to five endoscopic image databases of colonic lesions. For this purpose, we employ a specifically designed experimental setup to avoid biases in the outcomes caused by differing numbers of images per image database. The image databases were obtained using different imaging modalities. Two databases were obtained by high-definition endoscopy in combination with i-Scan technology(one with chromoendoscopy and one without chromoendoscopy). Three databases were obtained by highmagnification endoscopy(two databases using narrow band imaging and one using chromoendoscopy). The lesions are categorized into non-neoplastic and neoplastic according to the histological diagnosis.RESULTS Generally, it is feature-dependent which imaging modalities achieve high results and which do not. For the high-definition image databases, we achieved overall classification rates of up to 79.2% with chromoendoscopy and 88.9% without chromoendoscopy. In the case of the database obtained by high-magnification chromoendoscopy, the classification rates were up to 81.4%. For the combination of high-magnification endoscopy with NBI, results of up to 97.4% for one database and up to 84% for the other were achieved. Non-neoplastic lesions were classified more accurately in general than non-neoplastic lesions. It was shown that the image recording conditions highly affect the performance of automated diagnosis systems and partly contribute to a stronger effect on the staging results than the used imaging modality.CONCLUSION Chromoendoscopy has a negative impact on the results of the methods. NBI is better suited than chromoendoscopy. High-definition and high-magnification endoscopy are equally suited.     

Time saving with narrow-band imaging for distinguishing between neoplastic and non-neoplastic small colorectal lesions

Background and Aims: For colonoscopic examinations, the narrow‐band imaging (NBI) system is more convenient and timesaving than magnifying chromoendoscopy (MCE). However, the time‐saving aspects of NBI techniques have not been assessed. The present study compared interpretation times between NBI and MCE techniques in distinguishing between neoplastic and non‐neoplastic small colorectal lesions. Methods: Between January and March 2010, 693 consecutive patients who underwent colonoscopy at the National Cancer Center Hospital, Tokyo, Japan, were enrolled. When the first lesion was detected by conventional white‐light observation, the patient was randomly assigned to undergo a sequence of NBI and MCE observations (group A: NBI–MCE, group B: MCE–NBI). The time to diagnosis with each modality (NBI, from changing to NBI until diagnosis; MCE, from the start of indigo carmine solution spraying until diagnosis) was recorded by an independent observer. The sensitivity, specificity, and diagnostic accuracy of the first modality used in each group (NBI or MCE) were assessed by referring to the histopathological data. Results: Seventy‐one patients with 137 lesions were randomized to group A, and 80 patients with 163 lesions to group B. The median interpretation times were 12 s (interquartile range [IQR]: 7–19 s) in group A, and 17 s (IQR: 12–24 s) in group B, the difference being significant (P < 0.001). No significant differences were observed between NBI and MCE in terms of sensitivity, specificity, and diagnostic accuracy. Conclusions: NBI reduces the interpretation times for distinguishing between neoplastic and non‐neoplastic small lesions during colonoscopies, without loss of diagnostic accuracy.     

DIAGNOSTIC ACCURACY OF PIT PATTERN AND VASCULAR PATTERN ANALYSES IN COLORECTAL LESIONS

Background: The aim of this prospective study is to compare the usefulness of magnifying narrow band imaging (NBI) and magnifying chromoendoscopy in the diagnosis of colorectal lesions. Methods: The subjects were 1185 patients who underwent a complete colonoscopic examination and endoscopic or surgical treatment, from January 2006 to February 2008. A total of 1473 lesions were evaluated (53 hyperplastic polyps, 1317 adenomas, 103 submucosally invasive cancers). The digital images with NBI or chromoendoscopy were recorded and diagnosed independently from each other by two endoscopists who were blinded to the final pathological diagnosis. Results: We could differentiate between neoplastic and non‐neoplastic lesions with sensitivity of 88.9%, specificity of 98.5% and accuracy of 98.2% according to the vascular pattern. By recognizing an irregular or sparse pattern with NBI, massively invasive submucosal cancer could be diagnosed with the sensitivity and specificity of 94.9% and 76.0%. Using chromoendoscopy, we could differentiate between neoplastic and non‐neoplastic lesions with sensitivity of 86.8% and specificity of 99.2%. We were able to differentiate between massively invasive cancers and slightly invasive cancers using the pit patterns with sensitivity of 89.7% and specificity of 88.0%. The specificity was superior to that of NBI colonoscopy. Conclusion: Both NBI and chromoendoscopy can be useful for distinguishing between neoplastic and non‐neoplastic lesions. In the diagnosis of submucosal cancer, pit pattern diagnosis was slightly superior to vascular pattern diagnosis. It is desirable to perform chromoendoscopy in addition to NBI for distinguishing between slightly and massively invasive submucosal cancer lesions and determining the treatment.     

Detectability of colorectal neoplastic lesions using a narrow‐band imaging system: A pilot study

Background and Aim: Flat and depressed colorectal neoplastic lesions can be difficult to identify using conventional colonoscopy techniques. Narrow‐band imaging (NBI) provides unique views especially of mucosal vascular network and helps in visualization of neoplasia by improving contrast. The aim of this study was to assess the feasibility of using NBI for colorectal neoplasia screening. Methods: Forty‐seven consecutive patients, who underwent high definition colonoscopy (HDC) screening examinations revealing neoplastic lesions, were enrolled in our prospective study. No biopsies or resections were performed during the initial HDC, but patients in whom lesions were detected underwent further colonoscopies using NBI, with the results of the first examination blinded from the colonoscopist. They then received appropriate treatment. We compared diagnostic detection rates of neoplastic lesions for HDC and NBI procedures using total number of all identified neoplastic lesions as reference standard. Results: Altogether, 153 lesions were detected and analyzed in 43 patients. Mean diagnostic extubation times were not significantly different (P = 0.18), but the total number of lesions detected by NBI was higher (134 vs 116; P = 0.02). Based on macroscopic type, flat lesions were identified more often by NBI (P = 0.04). As for lesion size, only flat lesions < 5 mm were detected more frequently (P = 0.046). Lesions in the right colon were identified more often by NBI (P = 0.02), but NBI missed two flat lesions ≥ 10 mm located there. Conclusions: Narrow band imaging colonoscopy may represent a significant improvement in the detection of flat and diminutive lesions, but a future multi‐center controlled trial should be conducted to fully evaluate efficacy for screening colonoscopies.     

Efficacy of high magnification chromoscopic colonoscopy for the diagnosis of neoplasia in flat and depressed lesions of the colorectum: a prospective analysis

BACKGROUND: High magnification chromoscopic colonoscopy (HMCC) permits the in vivo examination of the colorectal pit pattern, which has a high correlation with stereomicroscopic appearances of resected specimens. This new technology may provide an "optical biopsy" which can be used to aid diagnostic precision and guide therapeutic strategies. Conflicting data exist concerning the accuracy of this technique when discriminating neoplastic from non-neoplastic lesions, particularly when flat and depressed. AIM: To prospectively examine the efficacy of HMCC for the diagnosis of neoplasia in flat and depressed colorectal lesions using standardised morphological, pit pattern, and histopathological criteria. Clinical recommendations for the use of HMCC are made. METHODS: Total colonoscopy was performed on 1850 patients by a single endoscopist from January 2001 to July 2003 using the C240Z magnifying colonoscope. Identified lesions were classed according to the Japanese Research Society guidelines, and pit pattern according to Kudos modified criteria. Pit pattern appearances were then compared with histopathology. RESULTS: A total of 1008 flat lesions were identified. The sensitivity and specificity of HMCC in distinguishing non-neoplastic from neoplastic lesions were 98% and 92%, respectively. However, when using HMCC to differentiate neoplastic/non-invasive from neoplastic/invasive lesions, sensitivity was poor (50%) with a specificity of 98%. Diagnostic accuracy was not influenced by size or morphological classification of lesions. CONCLUSION: HMCC has a high overall accuracy at discriminating neoplastic from non-neoplastic lesions but is not 100% accurate. HMCC is a useful diagnostic tool in vivo but presently is not a replacement for histology. Requirements for further education and training in these techniques need to be addressed.     

Further validation of magnifying chromocolonoscopy for differentiating colorectal neoplastic polyps in a health screening center

BACKGROUND AND AIM: The accuracy of conventional colonoscopy to differentiate neoplastic and non-neoplastic polyps is limited, justifying a biopsy for histologic analysis. Magnifying chromocolonoscopy has emerged as the best tool available for differentiating adenomatous and hyperplastic polyps during colonoscopy; however, magnifying endoscopes are rarely used in endoscopy units. This study aimed to further validate the effectiveness of magnifying chromocolonoscopy in the diagnosis of neoplastic colorectal polyps in a screening center. METHOD: Five hundred average-risk subjects were randomly divided into two groups: a magnifying chromocolonoscopy group and a conventional chromocolonoscopy group, each of 250 subjects. Lesions were analyzed according to Kudo's classification of pit pattern (types I-V) and additionally subdivided into non-neoplastic (types I-II) and neoplastic (types III-V). Lesions judged as neoplastic were resected and those judged as non-neoplastic were left in situ. Only lesions < or =10 mm were included in the study. Resected lesions were analyzed with histopathological examination. RESULTS: The overall accuracy of magnifying chromocolonoscopy for differentiating neoplastic lesions (95%, 135 of 142), was significantly higher than that of conventional chromocolonoscopy (84%, 102 of 122; P < 0.01). The accuracy of magnifying chromocolonoscopy for differentiating neoplastic lesions < or =5 mm was 94% (135 of 142), whereas that of conventional chromocolonoscopy was only 78% (69 of 89; P < 0.001). Results were not affected by the macroscopic types. CONCLUSION: Magnifying chromocolonoscopy is superior to conventional chromocolonoscopy for the diagnosis of colorectal neoplastic lesions in the setting of a health testing center.     

窄带成像内镜下NICE分型对结直肠肿瘤的诊断价值

目的探讨采用非放大内镜的简化的窄带成像技术（NBI）内镜下分型系统（NICE分型）在内镜诊断结直肠肿瘤中的应用价值。方法对结肠镜检查发现的181处结直肠新生性病变进行NBI内镜检查,观察病变的颜色、微血管结构及表面结构,依据NICE分型标准预测病变性质,并与内镜下或外科手术切除后标本的病理结果进行对比分析。结果NBI内镜下NICE总体分型诊断结直肠肿瘤的总体敏感度、总体特异度、总体阳性预测值、总体阴性预测值和总体准确率分别为95．8％（114／119）、91．9％（57／62）、95．8％（114／119）、91．9％（57／62）和94．5％（171／181）;对微小息肉（≤0．5cm）、小息肉（〉0．5—0．9em）和大息肉（〉0．9Cm）诊断的准确率分别为90．0％（72／80）、95．9％（47／49）和98．1％（51／52）,差异无统计学意义（P=0．175）;诊断直乙结肠微小肿瘤的敏感度、特异度、阳性预测值、阴性预测值和准确率分别为87．5％（14／16）、95．2％（20／21）、93．3％（14／15）、90．9％（20／22）和91．9％（34／37）。结论依据NICE分型标准使用高分辨率NBI能够较好区分结直肠肿瘤性和非肿瘤性病变,基本可以满足临床需要。     

窄带内镜、染色内镜与常规内镜对远端大肠ACF发现率的对比研究

目的比较常规内镜与窄带内镜（NBI）、染色内镜对远端大肠异常隐窝灶（aberrant cryptfoci,ACF）的发现率。方法选择2011年8月至12月就诊于江西省萍乡市人民医院准备接受结肠镜检查的患者670例,用随机数字表法将患者分为3组：其中常规内镜组228例、NBI组220例、染色内镜组222例。比较三种方法对远端大肠ACF检出率及各组间所用操作时间。结果在三组中,共发现155例ACF病例数。常规内镜、NBI组及染色内镜组发现ACF病例数分别为5例（2.19%）、25例（11.36%）,125例（56.31%）,三组组间比较有显著性统计学差异（P〈0.01）。但是与常规内镜相比,NBI组、染色内镜组操作时间有所延长。结论染色内镜能大幅提高远端大肠ACF发现率。NBI内镜较常规白光内镜能提高远端结肠ACF发现率,但比染色内镜低。常规白光内镜对远端结肠ACF发现率低。