The primary objective of this study is to evaluation the success of endoscopic treatment of Zenker's diverticulum using a LigaSure device (thermal fusion of vessels) via a measure of swallowing function at 12 months post-surgery.

Our secondary objectives are:

A. To evaluate short-term (pain, fever, time to start of eating) and medium-term (weight, swallowing) post-operative parameters.

B. To evaluate the prevalence of post-operative complications.

Inclusion Criteria:

• The patient must have given his/her informed and signed consent
• The patient must be insured or beneficiary of a health insurance plan
• The patient is available for 12 months of follow-up
• The patient has a Zenkers diverticulum as confirmed by a pharyngo-oesophagean transit test, regardless of van Overbeek classification

Exclusion Criteria:

• The patient is participating in another study
• The patient is in an exclusion period determined by a previous study
• The patient is under judicial protection, under tutorship or curatorship
• The patient (or his/her person-of-trust) refuses to sign the consent
• It is impossible to correctly inform the patient
• The patient does not read french
• The patient is pregnant
• The patient is breastfeeding
• The patients has a contraindication for a treatment necessary for this study, or for general anesthesia
• The patent has a history of complications related to hemostasis
• The preoperative checkup indicates potential for hemostasis related problems