1. Primary Esophageal Motility Disorders
Douglas G. Adler, MD, Yvonne Romero, MD 
Mayo Clinic Proceedings 
Volume 76, Issue 2, Pages (February 2001)
DOI: /
Copyright © 2001 Mayo Foundation for Medical Education and Research Terms and Conditions

2. Figure 1
Lateral view of barium swallow test in a patient with achalasia. Note grossly dilated esophagus with abrupt tapering to “bird beak-like” shape of lower esophageal sphincter.
Mayo Clinic Proceedings  , DOI: ( / )
Copyright © 2001 Mayo Foundation for Medical Education and Research Terms and Conditions

3. Figure 2
Anteroposterior view of barium swallow test in a patient with diffuse esophageal spasm. Note “corkscrew” appearance of esophagus during tertiary contraction.
Mayo Clinic Proceedings  , DOI: ( / )
Copyright © 2001 Mayo Foundation for Medical Education and Research Terms and Conditions