Mungan Syndrome, also known as visceral neuromyopathy, familial, with pseudoobstruction, megaduodenum, barrett esophagus, and cardiac abnormalities, is related to meier-gorlin syndrome 1 and visceral myopathy 1. An important gene associated with Mungan Syndrome is RAD21 (RAD21 Cohesin Complex Component). Affiliated tissues include kidney, and related phenotypes are abdominal pain and gastroparesis