Figure 3 - Radiologic appearance of some motor disorders of smooth muscle portion of the esophagus.

The figures are stills from the linked videos. a; Classical achalasia, showing a dilated esophageal body bird beak-like narrowing of lower esophageal sphincter (see Video 1). b; Vigorous achalasia showing diffuse spasm-like contractions in the esophageal body with closed lower esophageal sphincter (see Video 2). c; Diffuse esophageal spasm shows typical corkscrew appearance of the lower part of the esophagus (see Video 3). d: Midesophageal propulsion diverticulum with esophageal motility disorder (see Video 5). e; Normal peristaltic sequence for comparison with slow esophageal transit (see Video 6). f; Hypotensive (incompetent) esophageal peristalsis with slow esophageal transit through the esophagus (see Video 7). g; Gastroesophageal reflux (see Video 8). h; A sliding hiatal hernia (see Video 9). (Courtesy of Dr F.I. Habib)