Following features of achalasia cardia are seen. On plain x-ray an absence of fundal gas shadow, widened mediastinum and an air fluid level in mediastinum is also seen. The gold standard investigation is a 24 hours manometry of oesophagus. It shows non-relaxation of lower oesophageal sphincter, increased tone of oesophageal sphincter, atonic oesophagus. Bird-beak sign and rat-tail sign can be appreciated on barium swallow.
Triple-A syndrome
Alacrima
GRACILE syndrome
Rotor syndrome
ZTTK syndrome
ATR-16 syndrome
GAPO syndrome
ATR-X syndrome