非拡大内視鏡診断

Diagnosis of early colorectal cancer using conventional colonoscopy

早期大腸癌の深達度診断の基本は通常観察（非拡大内視鏡診断）であり，観察の基本とSM高度浸潤癌の内視鏡所見を理解する必要がある。大腸laterally spreading tumor（LST）の亜分類ではそれぞれSM浸潤の特徴があり，厳格に分類すべきである。大腸subepithelial lesion（SEL）の内視鏡診断については病変を多角的にとらえて鑑別疾患をあげ，病理組織像を想像しながら診断する過程が肝要である。

　The basis for diagnosing the depth of invasion of early colorectal cancer is conventional observation (non-magnifying endoscopic diagnosis), and it is necessary to understand the basics of observation and the endoscopic findings of highly invasive SM cancer. Each subclassification of colorectal LST (laterally spreading tumor) has its own characteristics of SM invasion and should be strictly classified. When diagnosing endoscopic colorectal SEL (subepithelial lesion), it is important to consider the differential diagnosis from multiple angles and make a diagnosis while imagining the histopathological image.