What types of esophageal diverticula are there?
A pulsion diverticulum, the most common type, occurs due to increased intraluminal pressure related to esophageal dysmotility, is usually encountered in the middle to lower thirds of the esophagus, and often occurs with multiple other pulsion diverticula. It typically appears as an ovoid or round outpouching of the esophagus with a wide neck.
An epiphrenic diverticulum, a subtype of pulsion diverticulum, is located in the distal esophagus and is usually solitary.
A traction diverticulum occurs due to fibrosis in adjacent tissues, is usually seen in the middle third of the esophagus, and is usually solitary. It typically has a tented or triangular shape due to tethering by the adjacent scar tissue.