Achalasia Achalasia is characterized by oesophageal aperistalsis and impaired relaxation of the lower oesophageal sphincter.   Clinical features Achalasia incidence is 1 : 100 000 equally in males and females. It occurs at all ages but is rare in childhood. Patients usually have a long history of intermittent dysphagia, characteristically for both liquids and solids from the onset. Regurgitation […]