Megaesophagus, also known as esophageal achalasia, is related to megacolon and gastric dilatation. An important gene associated with Megaesophagus is TCN2 (Transcobalamin 2), and among its related pathways/superpathways are NF-kappaB Signaling and T-cell activation SARS-CoV-2. The drugs Methylene blue and Remifentanil have been mentioned in the context of this disorder. Affiliated tissues include liver and smooth muscle, and related phenotypes are neoplasm and digestive/alimentary