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![Colonoscopy quality and endoscopist factors: what are the required endoscopist conditions for high-quality colonoscopy to reduce colorectal cancer incidence and mortality?](https://image.oaes.cc/5b9cf87d-f881-44b0-a2e1-6096c07e2d07/4817.fig.2.jpg)
Figure 2. A case of a colorectal lateral spreading tumor. The lesion shown in Figure 2 is a lateral spreading tumor (LST) detected during colonoscopy, followed by endoscopic submucosal dissection. The pathological diagnosis after treatment was tubular adenoma with high-grade dysplasia. LSTs are known to have high malignant potential, but they are easily overlooked and can cause post-colonoscopy cancer. The detection of LSTs is essential, and the detection rate of these flat lesions may be a quality measurement of colonoscopy.