Figure 1From: Minimally invasive hybrid surgery combined with endoscopic and thoracoscopic approaches for submucosal tumor originating from thoracic esophagus Schematic representation of esophagoscopic approach and injection of blue-colored sodium hyaluronate solution. Sodium hyaluronate solution colored blue by indigo carmine was injected into the submucosal layer to define the incision layer and create a space between the tumor and submucosal layer.Back to article page