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要旨 大腸癌の深達度診断は精度向上への様々な工夫が進められている.超音波内視鏡(EUS),細径超音波プローブ(MS),拡大内視鏡(拡大)の有用性を強調する報告が増加している中で,早期大腸癌の深達度診断は通常内視鏡(CS)で十分であるとする意見も少なくない.CSの深達度正診率は内視鏡経験年数に比例して向上する.これに対しMSや拡大では,経験年数10年以上では向上がみられないものの,より年数の少ない内視鏡医で著明に向上し,経験年数による診断能の差は減少する.MSと拡大はCSに比べより客観的な深達度診断が可能であり,比較的経験年数の浅い内視鏡医の深達度診断能の向上に有用であることを示した.
Diagnosis of the depth of invasion of colorectal cancer is important for determination of treatment. Nowadays, new diagnostic modalities such as endoscopic ultrasound using a microscanner (MS) and magnifying endoscopy (ME) are widely applied in clinical practice. Newstheless, there are clinicians who insist that conventional Colonoscopy (CS) alone is sufficient for evaluating the depth of cancer invasion, saying that the diagnostic accuracy of CS increases with experience in its use. However, although the use of MS and/or ME may not be necessary for experienced colonoscopists, these modalities are of great use for inexperienced colonoscopists. This is due to the fact that both MS and ME provide more objective data for the assessment of the depth of invasion of colorectal cancer than CS.
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