3 types. Congenital (dog was born with it), secondary (dog has acquired it due to other illness), and idiopathic (dog has acquired it in later years for unknown reasons).Originally Posted By: MaggieRoseLeeI'm not quite sure what's meant about that statement.Quote:Mega can come out of no where for no reason but more often than not a source can be identified.
But what I do know is there do seem to be 2 types of mega. One is the genetic form puppies are born with, and this is the one I have quite a bit of personal knowledge about. The one I do NOT know as much about is one that occurs suddenly to older dogs with no warning or seeming cause. (this maybe the one EastGSD is thinking about?)
From the many articles I have read on MegaE it seems as if an identifiable cause is only found in only small percentage of cases. Usually it's Myasthenia Gravis or thyroid disease.
If the esophagus has been stretched out large enough for long enough despite the treatment of the underlying disease or anomoly causing it, it may never return to complete function.