Definition: aperistalsis of the oesophagus, failure of the cardiac sphincter to relax on swallowing.
Incidence: 1 per 100 000 per year.
Clinical features: Long history of intermittent dysphagia, aspiration pneumonia, retrosternal chest pain. Weight loss not usually marked.
Treatment: Endoscopic dilatation of cardiac sphincter with pneumatic bag. SE: gastroesophageal reflux.
ΔΔx Chagas disease (American trypanosomiasis), oesophageal Ca, oesophageal spasm, oesophageal diverticulum, pharyngeal pouch, oesophageal web, benign oesophageal stricture, CREST.