Tunneling technique for tumors under the mucosa (STER)
In some cases, tumors in the oesophagus and stomach can also grow under the mucous membrane. A new, minimally invasive procedure developed in Japan is used to remove these tumors: endoscopic resection using the tunneling technique (submucosal tunneling endoscopic resection - STER).
Similar to the treatment of achalasia using the POEM procedure, a small incision is first made in the mucosa a few centimetres above the tumor. An endoscope is used for this. This is pushed into the space created between the esophageal mucosa and its muscle layer. A tunnel is then formed through which the endoscope can reach the tumor. The tumor can then be carefully removed from the surrounding tissue. The tumor is then removed from the tunnel and the previously created incision in the mucous membrane is closed with several metal staples.
The procedure takes about one to two hours. The patient is anesthetized with a breathing tube. Patients should plan to stay in hospital for three to four days. Advice and information about the treatment is provided during the therapeutic endoscopy consultation.