Abstract:Objective?To investigate the preoperative identification of esophageal submucosal tumor by endoscope.?Methods?40 patients of esophageal submucosal tumors with lesions range from 1.0 to 2.0 cm from March 2012 to August 2016 were randomly divided into A, B groups. Patients in group A underwent submucosal tunneling endoscopic resection (STER) 3.0 cm from the lesions, while patients in group B first underwent submucosal injection of saline to mark the lesions, then perform STER in the same way. Then record the time of checking. ?Results?The average time of group A was (420.0 ± 25.0) s, the average time of B group was (300.0 ± 25.0) s, there was statistical differences between the two groups.?Conclusion?Preoperative identification of the lesions before STER holds more advantages.