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要旨●NBI拡大診断(CP Type IIIB)のT1b癌に対する診断能は,pit pattern診断(invasive pattern)と比べて,感度は同等(84.8% vs. 85.6%)であるが特異度が低い(88.7% vs. 99.4%).これは臨床的観点からすると,NBI拡大診断(CP Type IIIB)はT1b癌と診断したときにoversurgeryとなりやすいことを意味しており,現状では,より特異度の高いpit pattern診断が深達度診断のgold standardと言えるだろう.
In the diagnosis of invasive cancer, magnifying NBI(narrow band imaging)using capillary pattern classification had sensitivity equivalent to and specificity lower than pit pattern diagnosis. From the clinical viewpoint, if all cases of SM massively invasive cancer diagnosed using magnifying NBI but without pit pattern diagnosis were treated surgically, unnecessary surgeries would increase. At present, pit pattern diagnosis is the gold standard method for diagnosing the depth of invasion of early colorectal cancer.
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