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Narrow-Band Imaging Evaluated in Colon Cancer

Technique seen as more accurate than colonoscopy, comparable to chromoendoscopy

FRIDAY, March 23 (HealthDay News) -- Both low-magnification and high-magnification narrow-band imaging can distinguish neoplastic from non-neoplastic colorectal lesions, and its diagnostic accuracy is superior to conventional colonoscopy, according to a report published in the March issue of Gut.

Hsiu-Po Wang, M.D., of National Taiwan University Hospital in Taipei, and colleagues used conventional colonoscopy and low-magnification and high-magnification narrow-band imaging and chromoendoscopy to observe 180 colorectal lesions from 133 patients. They resected all of the lesions for histopathological analysis and randomly assigned the endoscopic images to two readers for review.

Compared to conventional colonoscopy, the researchers found that narrow-band imaging and chromoendoscopy scored better under high-magnification than low-magnification. They also found that narrow-band imaging and chromoendoscopy had significantly higher diagnostic accuracy than colonoscopy.

"Our results warrant further study of the narrow-band imaging system to determine its diagnostic accuracy in screening or surveillance colonoscopy in well-designed randomized trials, to assess its ability to diagnose the depth of invasion of neoplastic lesions, as well as to establish diagnostic criteria or a classification system of vascular network pattern for increased diagnostic accuracy," the authors conclude.

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