Proportion of esophageal keratinized area ≥ 30% reduces accuracy of preoperative endoscopic evaluation in early esophageal squamous cell carcinoma

Figure 3 Hematoxylin and eosin staining of resected specimens obtained through endoscopic mucosal dissection of epithelial keratosis in early Esophageal squamous cell carcinoma. A: 10 ×; B: 40 ×; C: 100 ×; D: 200 ×. Blue arrows indicate tumor areas not covered by epithelial keratosis; orange arrows indicate tumor surfaces covered with esophageal keratinization.