achalasia
noun [ U ] medical specialized uk/ˌæk.əˈleɪ.ʒə/ us/ˌæk.əˈleɪ.ʒə/
失弛缓症（由于食管括约肌弛缓不全致使无法正常吞咽）
a condition in which the sphincter muscle of the oesophagus does not relax enough to allow someone to swallow normally
Patients with advanced achalasia may be better managed with primary oesophageal resection. 失弛缓症严重的患者可能直接采用食道切除术效果会比较好。