Killian-Jamieson diverticula are rare and arise from the lateral wall of the pharyngo-esophageal junction below the cricopharyngeus muscle and lateral to longitudinal muscular fiber of esophagus.

Zenker diverticula are much more common and arise from the posterior wall of the pharyngo-esophageal junction, below the superior pharyngeal constrictor and above the cricopharyngeus muscle.

This case is a nice demonstration of both diverticula.