Tumor size discrepancy between endoscopic and pathological evaluations in colorectal endoscopic submucosal dissection

Figure 1 Flowchart of lesion enrollment in this study. Of the 395 colorectal lesions removed by endoscopic submucosal dissection, 377 were enrolled in this study. A total of 286 lesions obtained correct size evaluation. Most of the incorrect scaling lesions were underscaled (75 of 91 lesions).

Figure 2 Representative cases of incorrect scaling. A: Underscaling case. The tumor size was evaluated as 30 mm; B: Pathology revealing the maximal diameter as 49 mm, wherein the size discrepancy was -39%; C: Overscaling case. The cancerous lesion was evaluated as 20 mm; D: The pathological size was 15 mm, resulting in a size discrepancy of 33%.

Figure 3 Lesion distribution in terms of size discrepancy. Incorrect scaling was made in 24%, which were mostly underscaled.