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===Secondary to [[Key-Gaskell Syndrome]]===
===Secondary to [[Key-Gaskell Syndrome]]===
===Acquired megaoesophagus===
*Occurs spontaneously in adult in any disorder that disrupts normal reflex involved in swallowing either peripheral or central.
*These can include:
**Viral encephalitides
**Peripheral neuropathies
***Degeneration or inactivity of local myenteric nerve plexuses (Auerbach’s plexuses),
***or to lesions in the vagus nerve or the central nucleus in the medulla of the brain which supply the [[Oesophagus - Anatomy & Physiology|oesophagus]].
**Poisonings such as:
***Lead
***Tetanus
***Botulism
**Myopathies.
*The result is the presence of a hypotonic [[Oesophagus - Anatomy & Physiology|oesophagus]] in which food accumulates causing distension
*Usually the thoracic oesophagus from the thoracic inlet to the diaphragm is affected and grossly the [[Oesophagus - Anatomy & Physiology|oesophagus]] is dilated, thin-walled and hypotonic.
[[Category:Oesophagus - Pathology]]
[[Category:Oesophagus - Pathology]]
[[Category:Cat]][[Category:Dog]]