What Kind of Conditions Cause Megaesophagus?
Most cases are young puppies (Great Danes, Irish setters, German Shepherds are genetically predisposed). In these cases the condition is believed congenital though it often does not show up until the pup begins to try solid food. Congenital megaesophagus is believed to occur due to incomplete nerve development in the esophagus. The good news is that nerve development may improve as the pet matures. Prognosis is thus better for congenital megaesophagus than it is for megaesophagus acquired during adulthood. Another congenital problem is the “Vascular Ring Anomaly.” This is a band of tissue constricting the esophagus. Such tissue bands are remnants of fetal blood vessels which are supposed to disappear before birth. They do not always do so. Improvement is obtained when the band is surgically cut but in 60% of cases some residual regurgitation persists. In adult dogs, diseases that cause nerve damage can lead to Megaesophagus. Myasthenia gravis would be a common cause and very important
