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This case report presents a 65-year-old man who developed early esophageal cancer with leiomyoma treated by endoscopic submucosal dissection(ESD).There have been several reports of co-existing superficial esophageal cancer and leiomyoma treated by endoscopic mucosal resection.However,there is no previous report describing the co-existing lesion treated by ESD.In order to determine treatment strategies for esophageal cancer,accurate endoscopic evaluation of the cancerous depth is essential.In the present case,the combination of endoscopic ultrasonography and narrow-band imaging system with magnifying endoscopy was extremely useful to evaluate the superficial esophageal cancer with leiomyoma,which lead to the appropriate treatment,ESD.