All of the following statements about Zenker's diverticulum are true Except:

Zenker's diverticulum is out pouching of the posterior pharyngeal wall, where pharyngeal mucosa herniates through the Killian's dehiscence (the weak area between the upper oblique fibres and the lower horizontal fibres of the inferior constrictor muscle). Zenker's diverticulum is an acquired diverticulum and not a congenital diverticulum. It's a false diverticulum as it does not contain all the anatomic layers of the oesophageal wall. Barium swallows are diagnostic. Lateral views are essential as these are posterior outpouchings.