<prompt> In which of the following conditions uniform dilation of esophagus is seen -SclerodermaAchalasia cardiaDermatomysitisAll  <response>: Ans. is b i.e., Achalasia cardia Achalasia cardia Achalasia cardia is a motor disorder of the esophageal smooth muscle, characterized by ? 1. Aperistalsis 2. Failure of relaxion of the LES with swallowing 3. Increased resting tone of LES 