Modified Peroral Endoscopic Myotomy Technique for Type II Achalasia: A Multicenter Retrospective Study

Figure 1

(a) The red arrow indicates the circular muscle layer, the black arrow indicates the longitudinal muscle layer, and the yellow arrow indicates the external coat of the esophagus. (b) The red arrow indicates the circular and longitudinal muscle layers, and the black arrow indicates the external coat of the esophagus.

(a)

(b)