内镜治疗111例胃息肉的临床病理特征分析

背景：胃息肉的检出率逐年增高,其临床症状不明显且有一定癌变倾向。目的：了解胃镜下胃息肉的临床和病理特征。方法：对2010年1月～2013年1月新疆医科大学第一附属医院检出的111例胃息肉患者的内镜、病理资料和手术情况进行回顾性分析。结果：本组老年患者（≥60岁）为胃息肉高发人群（56．8％）;单发性息肉80例（72．1％）,多发性息肉31例（27．9％）;息肉主要位于胃体（52．3％）;息肉直径≤0．5cm多见（69．4％）;息肉类型主要为增生性息肉（40．5％）和炎性息肉（33．3％）。息肉治疗以活检钳钳除30例,内镜黏膜下注射0．9％NaCl溶液联合高频电切摘除54例,内镜下黏膜切除术（EMR）治疗6例,内镜黏膜下剥离术（ESD）治疗4例,余17例行外科手术治疗。12例患者接受随访,其中2例复发。结论：胃息肉直径较小,多为单发;息肉主要位于胃体,以增生性息肉和炎性息肉为主;治疗方式多选择内镜下切除,息肉切除后有复发的可能性,应加强随访。     

结直肠息肉癌变的内镜下表现、治疗及癌变因素分析

目的探讨结直肠息肉癌变的内镜下表现,分析癌变相关因素和治疗策略。方法回顾性分析经电子结肠镜检查或治疗的77例结直肠癌变息肉患者的临床、内镜及病理资料,探讨影响结直肠息肉癌变的相关因素及其内镜下治疗策略。结果77例癌变结直肠息肉中,9例伴发结肠癌。60例有临床症状,症状发生率为77．9％（60／77）。息肉癌变主要分布在乙状结肠,多发生于年龄超过60岁的老年患者,绒毛状腺瘤癌变率最高。行电子结肠镜电切法切除44例,其中完全切除38例。结论年龄〉60岁患者和乙状结肠息肉癌变发生率明显增高,选择性对属于原位癌或早期浸润癌的癌变息肉行电子结肠镜下切除是安全有效的。     

大肠锯齿状腺瘤的内镜表现和癌胚抗原表达

目的探讨大肠锯齿状腺瘤（SA）的内镜特征和癌胚抗原的表达情况。方法选择2005年6月-2008年7月在消化内镜室检出的SA患者27例（SA组）,另选择同期检出的进展期结直肠腺癌（ACC）患者共26例（ACC组）。结肠镜检查发现大肠息肉后用0．4％靛胭脂溶液进行喷洒染色并判断息肉的腺管开口,采用活检钳钳咬、高频电切除术、EMR等方法摘除息肉,对大肠癌等病灶则采用活检钳钳咬组织。上述标本进行病理组织学常规检查和腺体组织癌胚抗原（CEA）免疫组化染色。结果SA组锯齿状腺瘤47枚,其它类型息肉27枚。SA形态以隆起亚蒂型多见,2枚最大径≥10mm,45枚最大径在3～8mm。SA腺管开口较常见到Ⅱ型pit与ⅢL型pit的混合表现,Ⅱ型pit也占一定比例,好发部位均在左半结肠。SA的腺瘤性腺体CEA阳性表达明显强于其增生性腺体CEA阳性表达（P〈0．01）。结论SA是一种独特的大肠腺瘤类型,其瘤细胞已有较强合成CEA能力,具备一定的恶变潜能,临床医师应予以高度重视。     

内镜黏膜切除术治疗大肠广基大息肉

目的探讨内镜黏膜切除术(EMR)对肠道广基大息肉样病变的治疗价值。方法采用结肠镜下大肠黏膜切除术治疗135例共157个结直肠广基大息肉。病灶黏膜下注射肾上腺素生理盐水后,一次圈套整块切除或分次圈套切除病变,回收全部标本送病理检查,术后结肠镜随访。结果全部息肉EMR一次切除,除3个位于直肠黏膜下的病灶小于1 cm外,其余均大于1.5 cm,最大的13 cm×12 cm,无手术并发症。术后病理:腺瘤123个,其中有异型增生80个;黏膜内癌11个;增生性息肉20个;直肠类癌3个。随访中,有2例大于7 cm的直肠腺瘤分别于术后1个月及3个月复查时复发,均给予热活检钳完整钳除,病理分别为增生性息肉和绒毛状腺瘤,再复查6-12个月无复发。结论EMR是治疗大肠癌前病变及黏膜内癌安全、有效的方法。     

电子结肠镜手术治疗小儿大肠息肉95例临床分析

目的观察电子结肠镜手术治疗小儿大肠息肉的效果和安全性。方法对95例（124颗）大肠息肉患儿采用Olympus CF-240I电子结肠镜行内镜治疗,24例较大患儿未用镇静剂、余71例均给予丙泊酚全麻,直径〉1.0cm的有蒂息肉行高频电切术、直径〈1.0 cm的无蒂息肉或较小息肉行高频电凝术、直径〈0.5 cm的半球形息肉行钳除法摘除术;收集息肉切除标本进行病理检查。记录手术情况、术后随访情况及病理类型。结果 124颗息肉中行高频电凝切除98颗、活检钳钳除26颗,病理类型为幼年性息肉70例（73.7%）、P-J息肉11例（11.6%）、炎性息肉7例（7.13%）、增生性息肉4例（4.2%）、腺瘤性息肉3例（3.2%）;术后便血、腹痛症状均消失,且无明显出血、穿孔等并发症;随访1 a,3例发生便血,其中2例为P-J息肉、1例为幼年性息肉,经再次肠镜检查证明息肉复发。结论电子结肠镜手术治疗小儿大肠息肉效果好、安全性高。     

大肠腺瘤摘除后5年复发率及随访间期的探讨

初步探讨大肠腺瘤摘除后的复发率及随访间期。方法：107例经病理检查确诊为大肠腺瘤者,在腺瘤摘除后第3年及第5年行全结肠镜随访;随机选择107例初次结肠镜检查正常者在第5年随访全结肠镜作为对照。结果：对照组60例接受随访者中,5年发现有小腺瘤或息肉（8．3％）。腺瘤组第3年72例接受随访者中,23例（31．9％）发现管状腺瘤或增生性息肉;第5年有76例患者接受随访,共发现25例37枚息肉（复发率32．9％;95％可信区间;22．1％－43．7％）,复发率明显高于对照组（P＜0．01）,其中23例为状腺瘤,2例为增生性息肉,最大腺瘤直径为12mm。第5年时,原腺瘤数为1、2或2枚以上者的复发率分别为20．0％、38．9％和55．6％（P＝0．024）;原腺瘤直径≤5mm及＞5mm者的复发率分别为23．4％和48．3％（P＝0．025）;复发率与患者的年龄及腺瘤位置关系不大。结论：多发性腺瘤患者及较大腺瘤者较易复发;腺瘤后5年内随访是安全的;对小的单发低度增生不良腺瘤患者及初次检查正常者,可延长随访间期。     

代谢综合征对结直肠管状绒毛状腺瘤的影响因素分析

目的分析结直肠管状绒毛状腺瘤与代谢综合征的关系。 方法收集2017年6月至2020年12月南方医科大学附属惠阳医院经手术病理确诊的271例患者。其中管状腺瘤患者203例，管状绒毛状腺瘤患者68例。比较结直肠管状腺瘤与管状绒毛状腺瘤患者纤维结肠内镜检查的基本情况，结直肠息肉一般特征、数目、病理，以及代谢综合征相关指标水平等。采用Logistic多因素回归分析山田分型、最大息肉直径、代谢综合征相关指标与结直肠管状绒毛状腺瘤的关系。 结果累计息肉数目最多部位、最大息肉好发部位、病理为管状绒毛状腺瘤/管状腺瘤好发部位均为乙状结肠。结直肠管状腺瘤与管状绒毛状腺瘤患者山田分型、最大息肉直径、血清甘油三酯水平差异均有统计学意义（P均<0.01），而高血压、脂肪肝、空腹血糖受损或糖尿病情况及总胆固醇水平、血清尿酸水平、癌胚抗原水平差异均无统计学意义（P>0.05）。Logistic多因素回归分析结果显示，山田分型及最大息肉直径与结直肠管状绒毛状腺瘤有关联[Wald χ²=5.756，Exp（B）=2.494，P=0.016；Wald χ²=23.173，Exp（B）=12.842，P<0.001]，而血清甘油三酯水平与结直肠管状绒毛状腺瘤无关联。 结论与结直肠管状腺瘤患者相比，代谢综合征与结直肠管状绒毛状腺瘤发病并无直接关联，但息肉直径大小及山田分型与结直肠管状绒毛状腺瘤发病有关联。     

非放大内镜下NICE分型判断结直肠肿瘤性息肉的临床应用价值

目的 评估非放大内镜下窄带成像技术（NBI）国际结直肠内镜分型（NICE分型）系统判断结直肠肿瘤的临床实际应用价值。方法 回顾性纳入普通内镜医师行白光结肠镜检查检出、并行NBI观察及NICE分型的224处结直肠息肉资料,对NICE分型结果和内镜或外科手术切除标本的病理结果进行对比分析。结果 224处息肉中NICE 1型59处,2型159处,3型6处;病理诊断非肿瘤性息肉58处,肿瘤性息肉166处。依据NICE分型诊断肿瘤性息肉的总体敏感度、特异度、阳性预测值、阴性预测值和准确率分别为91.6%、77.6%、92.1%、76.2%和87.9%。NICE分型预测大息肉（直径≥10mm）、小息肉（直径6~9mm）和微小息肉（直径≤5mm）肿瘤性与否的敏感度和准确率分别为100.0%、97.0%、80.9%和95.7%、87.8%、83.3%,诊断准确率随病变直径变小而下降,但差异无统计学意义（P=0.694）。结论 临床实际工作中,普通内镜医师利用非放大内镜下NICE分型判断结直肠肿瘤总体准确率较高,具有一定临床推广应用价值。     

小肠细菌过生长及三酰甘油与老年人结直肠息肉临床关系的研究

目的 探讨小肠细菌过生长（small intestinal bacterial overgrowth,SIBO）及三酰甘油（triglyceride,TG）与老年人结直肠息肉的关系及其临床意义。方法 回顾性分析2018年10月—2021年1月在河北省沧州市中心医院同时行结肠镜及甲烷氢乳果糖呼气试验（lactulose breath test,LBT）检查的156例年龄≥65岁的老年结直肠息肉患者,根据结直肠息肉个数分为：单发结直肠息肉组、多发结直肠息肉组;根据结直肠息肉病理分型分为：炎性息肉组、腺瘤性息肉组;同时选取40例老年健康志愿者为健康对照组。分析比较各组的SIBO阳性率及空腹血总胆固醇（total cholesterol,TC）、TG水平。结果 结直肠息肉组的TC、TG水平及SIBO阳性率高于健康对照组（P=0.035,P=0.003,P=0.001）,三者在单发结直肠息肉组与多发结直肠息肉组间及炎性息肉组与腺瘤性息肉组间差异无统计学意义（P> 0.05）。SIBO阳性结直肠息肉患者的TC、TG水平高于SIBO阴性结直肠息肉患者（P=0.028,P=0.001）。高TG、...     

32例大肠锯齿状腺瘤临床、结肠镜及病理特点分析

目的探讨大肠锯齿状腺瘤患者的临床、结肠镜及病理特点。方法回顾性分析我院2008年4月-2009年12月消化内镜中心及病理科检出的32例大肠锯齿状腺瘤患者的临床、结肠镜及病理特点。结果32例大肠锯齿状腺瘤患者以腹痛就诊者20例（62．5％）,腹泻7例（21．7％）,便血2例（6．2％）,CEA升高体检2例（6．2％）,结肠癌术后复查1例（3．1％）;结肠镜检查病变位于直肠者18例（56．2％）,位于乙状结肠者3例（9．3％）,位于直乙交界处者5例（15．5％）,位于降结肠者2例（6．2％）,位于横结肠者3例（9．3％）,位于升结肠者1例（3．1％）;多发4例（12．5％）,单发28例（87．5％）;腺瘤直径多在1～6mm,最大直径20mm,平均直径9．5mm,32例大肠锯齿状腺瘤中广基息肉（Is）25例（77．3％）,亚蒂息肉（Isp）6例（19．6％）,有蒂息肉（Ip）1例（3．1％）。组织病理学检查为单纯锯齿状腺瘤8例（25．8％）,活检结果为锯齿状腺瘤,低级别上皮内瘤变22例（68．2％）,锯齿状腺瘤,局部高级别上皮内瘤变1例（3．1％）,锯齿状腺瘤,局部恶变1例（3．1％）,手术后病理证实为中分化腺癌。结论大肠锯齿状腺瘤作为一种独立的腺瘤形态与直结肠肿瘤密切相关,应引起重视。     

Is gastric cancer a new indication for surveillance colonoscopy? Colon cancer is increased in gastric cancer patients]

BACKGROUND/AIMS: It has been reported that the risk of gastric polyp is increased in various colonic polyposis syndromes or in series of patients with sporadic colonic polyps. However, there are only a few large case controlled studies of colon cancer incidence in gastric cancer patients who underwent colonoscopy. The aims of this study were to determine the incidence of colorectal neoplasm and to evaluate the necessity of colonoscopic surveillance in patients with gastric cancer. METHODS: We performed colonoscopy in 105 patients with gastric cancer who agreed to undergo colonoscopy before or after 6 months from gastric resection between January 2002 and December 2004 in Kangbuk Samsung hospital. As a control group, 269 consecutive, age and sex matched patients without gastric neoplasm on gastroscopy who underwent colonoscopy within 6 months for the evaluation of various gastrointestinal symptoms during the year 2004 were included. Endoscopic reports and pathological results were reviewed retrospectively. RESULTS: In the patient group, adenomatous polyps were diagnosed in 24/105 patients (22.9%) and colorectal adenocarcinoma in 10/105 patients (9.5%). In the control group, adenomatous polyps were diagnosed in 78/269 patients (29.0%) and colorectal adenocarcinoma in 2/269 patients (0.7%). The incidence of colorectal adenocarcinoma between the patient group and control group showed significant differences (odds ratio 11.04, p=0.003). CONCLUSIONS: The risk of colorectal adenocarcinoma increases significantly in patients with gastric cancer. We suggest that the patients with gastric cancer might carry a high risk for colorectal cancer whom require surveillance colonoscopy.     

Virtual colonography: identification and differentiation of colorectal lesions using multi-detector computed tomography

OBJECTIVE: Early detection of precancerous or malignant lesions may be decisive for prognosis of patients with colorectal cancer. In this prospective feasibility study, multi-detector spiral computed tomography (CT) colonography was compared with conventional colonoscopy for the detection of colorectal polyps. MATERIAL AND METHODS: Seventy-eight patients underwent CT colonography (standard colonoscopy preparation, distension with room air, prone and supine position) immediately before colonoscopy. Sixty-five (83%) were asymptomatic screening subjects, while the rest had symptoms suggestive of colorectal disease. Presence, location, and size of lesions were prospectively assessed. Sensitivity, specificity, and positive and negative predictive values of CT colonography were calculated using conventional colonoscopy as the reference standard. RESULTS: Conventional colonoscopy was normal in 52 patients. In 26 patients a total of 49 polyps and 3 carcinomas were identified. All three carcinomas and 39 polyps (80%) were identified by CT colonography. Seven of 7 polyps > or = 10 mm (100%), 13 of 16 polyps of 6 to 9 mm (81%), and 19 of 26 polyps < or = 5 mm (73%) in diameter were identified. Fourteen false-positive findings (10 of which were < or = 5 mm in diameter) were related to 8 patients (specificity at the patient level was 86%). In 10 patients, a total of 10 polyps were missed by CT colonography, 7 of which were < or = 5 mm in diameter. CONCLUSIONS: In this feasibility study, multi-detector spiral CT colonography allows accurate detection of polyps > 5 mm in diameter, but at the expense of low specificity in the small size range.     

Sensitivity of diagnostic examinations for colorectal polyps

The removal of adenomatous polyps of the large bowel reduces mortality from colorectal cancer (CRC). Faecal occult blood testing only reveals 20.40% of polyps. The flexible rectosigmoidoscope explores less than half of the large bowel. Its use should always be coupled with faecal occult blood testing which, if positive, requires a total colonoscopy. The sensitivity of double-contrast barium enema for the search of polyps is 35%. Colonoscopy does not reach the caecum in about 10% of cases. It misses 15-20% of polyps with diameter <10 mm and about 6% of polyps with diameter >10 mm. Virtual colonoscopy has substantially the same sensitivity as optical colonoscopy for polyps > or =7 mm in diameter.     

Colorectal polyp detection with virtual colonoscopy (computed tomographic colonography); the reliability of the method

BACKGROUND/AIMS: The aim of this study was to compare the reliability of virtual colonoscopy with conventional colonoscopy in detection of colorectal polyps. METHODOLOGY: Between November 1997 and February 2000, 23 patients (14 males, 9 females) aged 43-86 years (mean: 63) with colorectal polyps who underwent colonoscopy in our endoscopy unit, were referred for virtual colonoscopy. The colon was distended with an enema tube for rectal insufflation and subsequently was scanned by helical CT (Toshiba X-vision) using the following parameters: KV 120, mAs 200, table feed 5 mm/sec, slice thickness 5 mm and reconstruction intervals 2.5 mm. Using SPARC Station 20, virtual colonoscopy was generated. RESULTS: A total of 30 polyps (19 with diameter 8-15 mm and 11 larger than 15 mm) were detected with conventional colonoscopy. Virtual colonoscopy visualized 27 polyps (17 with diameter 8-15 mm and 10 with diameter > 15 mm). CONCLUSIONS: Virtual colonoscopy is a non-invasive, well-tolerated, safe technique and can be useful for detection of colorectal polyps. Weaknesses of the method are the inability to detect small lesions and to perform biopsies.     

Virtual colonography: Identification and differentiation of colorectal lesions using multi-detector computed tomography

Objective. Early detection of precancerous or malignant lesions may be decisive for prognosis of patients with colorectal cancer. In this prospective feasibility study, multi-detector spiral computed tomography (CT) colonography was compared with conventional colonoscopy for the detection of colorectal polyps. Material and methods. Seventy-eight patients underwent CT colonography (standard colonoscopy preparation, distension with room air, prone and supine position) immediately before colonoscopy. Sixty-five (83%) were asymptomatic screening subjects, while the rest had symptoms suggestive of colorectal disease. Presence, location, and size of lesions were prospectively assessed. Sensitivity, specificity, and positive and negative predictive values of CT colonography were calculated using conventional colonoscopy as the reference standard. Results. Conventional colonoscopy was normal in 52 patients. In 26 patients a total of 49 polyps and 3 carcinomas were identified. All three carcinomas and 39 polyps (80%) were identified by CT colonography. Seven of 7 polyps ≥10 mm (100%), 13 of 16 polyps of 6 to 9 mm (81%), and 19 of 26 polyps ≤5 mm (73%) in diameter were identified. Fourteen false-positive findings (10 of which were ≤5 mm in diameter) were related to 8 patients (specificity at the patient level was 86%). In 10 patients, a total of 10 polyps were missed by CT colonography, 7 of which were ≤5 mm in diameter. Conclusions. In this feasibility study, multi-detector spiral CT colonography allows accurate detection of polyps>5 mm in diameter, but at the expense of low specificity in the small size range.     

Fecal occult blood and flexible sigmoidoscopy screening for colorectal cancer: modeling the impact on colonoscopy requirements and cancer detection rates

AiM: The aim of this study was to estimate the colonoscopy requirements and the likely impact of fecal occult blood and flexible sigmoidoscopy screening on the detection of colorectal cancer by using previously published data. METHODS: Fecal occult blood and flexible sigmoidoscopy screening programs were applied to the 2.04 million subjects aged 50-65 years, at a participation rate of 40%. The following strategies were evaluated: Fecal occult blood testing with colonoscopy follow up of all positive tests; flexible sigmoidoscopy with colonoscopy follow up of all adenomatous polyps; and flexible sigmoidoscopy with colonoscopy follow up of all adenomatous polyps > 10 mm in size. RESULTS: The fecal occult blood program detected 5.6% of all colorectal cancer cases at a rate of 2,914 colonoscopies/percentage of detection of colorectal cancer. The flexible sigmoidoscopy program detected 14% of all colorectal cancer cases at a rate of 8,160 colonoscopies/percentage of detection of colorectal cancer. The flexible sigmoidoscopy program with follow up of adenomatous polyps > 10 mm in size detected 13% of all colorectal cancer cases at a rate of 1,230 colonoscopies/percentage of detection of colorectal cancer. CONCLUSIONS: Flexible sigmoidoscopy screening followed by colonoscopic follow up of adenomatous polyps > 10 mm in size is the most efficient screening strategy in terms of colonoscopies generated and cases of colorectal cancer detected.     

A prospective single centre study comparing computed tomography pneumocolon against colonoscopy in the detection of colorectal neoplasms

BACKGROUND AND AIMS: To determine the sensitivity and specificity of computed tomography (CT) pneumocolon in the detection of colorectal neoplasms. METHODS: A total of 201 consecutive patients with colorectal symptoms or requiring surveillance for colorectal neoplasms underwent both conventional colonoscopy and CT pneumocolon. RESULTS: On conventional colonoscopy 13 invasive colorectal carcinomas were detected in 13 patients, and 118 polyps in 63 patients (14 polyps were > or =1 cm in diameter, 25 were 6-9 mm, and 79 were < or =5 mm). CT pneumocolon detected all 13 cancers, two false positive cancers, but only 20 polyps (seven were > or =1 cm). This resulted in a sensitivity of 100% (95% confidence interval (CI) 87-100%) and specificity of 99% (95% CI 97-100%) for detection of invasive carcinoma, and a sensitivity of 73% (95% CI 56-90%) and specificity of 94% (95% CI 91-98%) for detection of invasive carcinoma and/or > or =1 cm polyps. CT pneumocolon also identified invasive carcinoma not seen at colonoscopy because of incomplete examination in three patients, and detected metastases in six colorectal carcinoma patients and extracolonic carcinoma in a further seven patients. CONCLUSIONS: CT pneumocolon had a high sensitivity and specificity for detection of invasive colorectal carcinoma but not colorectal polyps. CT pneumocolon may be suitable for initial investigation of patients with symptoms of colorectal malignancy.     

结肠镜诊疗大肠息肉1537例体会

大肠息肉是常见的肠粘膜病变,其大多数是被视为癌前病变的腺瘤。通过结肠镜检出大肠息肉并加以除,打断腺瘤一腺癌的进程,是防治大肠癌的重要措施。1992年1月至1999年12月8年间,我院7246例结肠镜检查检出大肠息肉1537例(2378枚),检出率21．2％。本对这些患的临床资料进行回顾性分析,希望能力大肠息肉的诊疗及大肠癌的防治工作提供一些有用的资料。     

A novel summary report of colonoscopy: timeline visualization providing meaningful colonoscopy video information

Purpose

The colonoscopy adenoma detection rate depends largely on physician experience and skill, and overlooked colorectal adenomas could develop into cancer. This study assessed a system that detects polyps and summarizes meaningful information from colonoscopy videos.

Methods

One hundred thirteen consecutive patients had colonoscopy videos prospectively recorded at the Seoul National University Hospital. Informative video frames were extracted using a MATLAB support vector machine (SVM) model and classified as bleeding, polypectomy, tool, residue, thin wrinkle, folded wrinkle, or common. Thin wrinkle, folded wrinkle, and common frames were reanalyzed using SVM for polyp detection. The SVM model was applied hierarchically for effective classification and optimization of the SVM.

Results

The mean classification accuracy according to type was over 93%; sensitivity was over 87%. The mean sensitivity for polyp detection was 82.1%, and the positive predicted value (PPV) was 39.3%. Polyps detected using the system were larger (6.3?±?6.4 vs. 4.9?±?2.5 mm; P?=?0.003) with a more pedunculated morphology (Yamada type III, 10.2 vs. 0%; P?<?0.001; Yamada type IV, 2.8 vs. 0%; P?<?0.001) than polyps missed by the system. There were no statistically significant differences in polyp distribution or histology between the groups. Informative frames and suspected polyps were presented on a timeline. This summary was evaluated using the system usability scale questionnaire; 89.3% of participants expressed positive opinions.

Conclusions

We developed and verified a system to extract meaningful information from colonoscopy videos. Although further improvement and validation of the system is needed, the proposed system is useful for physicians and patients.

     

Prospective Study Comparing Multislice CT Colonography With Colonoscopy in the Detection of Colorectal Cancer and Polyps

PURPOSE: Multislice CT colonography is an alternative to colonoscopy. The purpose of this study was to compare multislice CT colonography with colonoscopy in the detection of colorectal polyps and cancers. METHODS: Between June 2000 and December 2001, 45 males and 35 females (median age, 68 (29–83) years) with symptoms of colorectal disease were studied prospectively. All patients underwent multislice CT colonography and colonoscopy, and the findings were compared. RESULTS: Colonoscopy was incomplete in 18 (22 percent) patients because of obstructing lesions or technical difficulty, and multislice CT colonography was unsuccessful in 4 (5 percent) because of fecal residue. Colonoscopy was normal in 26 patients and detected 29 colorectal cancers and 33 polyps in 35 patients, diverticulosis in 16 patients, and colitis in 3 patients. Multislice CT colonography identified 28 of 29 colorectal cancers with one false negative and one false positive (sensitivity, 97 percent; specificity, 98 percent; positive predictive value, 96 percent; negative predictive value, 98 percent). Multislice CT colonography identified all 12 polyps measuring 10 mm in diameter (sensitivity, 100 percent), 5 of 6 measuring 6 to 9 mm in diameter (sensitivity, 83 percent), 8 of 15 polyps 5 mm (sensitivity, 53 percent), and false-positive for 8 polyps. The overall sensitivity was 74 percent and specificity 96 percent. The positive predictive value for polyps was 88 percent, and the negative predictive value was 90 percent. Multislice CT colonography also detected 5 of 16 patients with diverticulosis (sensitivity, 31 percent; specificity, 98 percent) and colitis in 2 of 3 patients (sensitivity, 67 percent; specificity, 100 percent). In ten (13 percent) patients, extracolonic findings on multislice CT colonography altered management and included five patients with colorectal liver metastases. In 15 (19 percent) patients, there were incidental findings that did not demand further investigation. CONCLUSIONS: The results from this study indicate that the efficacy of multislice CT colonography in the detection of colorectal cancers and polyps 6 mm is similar to colonoscopy. Multislice CT colonography allows clinical staging of colorectal cancers, outlines the whole length of the colon in obstructing carcinoma when colonoscopy fails, and can identify extracolonic causes of abdominal symptoms.