Dysfunction of the pharyngo-oesophageal sphincter may escape detection by clinical examination, endoscopy, and routine barium studies. Cineradiographic examination of 300 patients with unexplained dysphagia revealed 57 cases of pharyngo-oesophageal dysfunction. In 25 cases an underlying disorder could be found, and 32 cases were considered idiopathic. Radiologically 3 types of dysfunction may be distinguished, namely late opening, incomplete relaxation, and early contraction of the pharyngo-oesophageal sphincter. Cineradiography was found to be an easy and reliable method of detecting pharyngo-oesophageal sphincter dysfunction.
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