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==Description==
==Description==
[[Image:Oesophageal Stricture.png|thumb|right|300px|Oesophageal Stricture Oesophagoscopy - Copyright David Walker RVC]]
[[Image:Oesophageal Stricture.png|thumb|right|300px|An oesophageal stricture observed by oesophagoscopy - Copyright David Walker 2009 RVC]]
An oesophageal stricture is an abnormal circumferential narrowing of the oesophageal lumen secondary to severe [[Oesophagitis|oesophagitis]]. Deep injuries to the oesophageal wall heal by fibrosis which contracts over time to form the stricture. Animals may suffer from multiple strictures and the most common sites are within the '''distal high pressure zone''' (close to the lower oesophageal spincter), over the '''base of the heart''' and '''at the thoracic inlet'''. The oesophagus is narrower at these points and foreign bodies and refluxed ingesta are therefore more likely to accumulate at these locations. The most important causes of strictures include:
An oesophageal stricture is an abnormal circumferential narrowing of the oesophageal lumen secondary to severe [[Oesophagitis|oesophagitis]]. Deep injuries to the oesophageal wall heal by fibrosis which contracts over time to form the stricture. Animals may suffer from multiple strictures and the most common sites are within the '''distal high pressure zone''' (close to the lower oesophageal spincter), over the '''base of the heart''' and '''at the thoracic inlet'''. The oesophagus is narrower at these points and foreign bodies and refluxed ingesta are therefore more likely to accumulate at these locations. The most important causes of strictures include:
*'''Physical Injury'''
*'''Physical Injury'''
===Diagnostic Imaging===
===Diagnostic Imaging===
[[Image:Oesophageal Stricture Flouroscopy.png|thumb|right|300px|An oesophageal stricture observed by fluoroscopy in the region of the thoracic inlet - Copyright David Walker 2009 RVC]]
Fibrosing strictures must be differentiated from [[Vascular Ring Anomalies|vascular ring anomalies]], [[Oesophagitis|oesophagitis]] and intraluminal and extraluminal masses. This can be done with plain and contrast radiography, endoscopy and ultrasonography.
Fibrosing strictures must be differentiated from [[Vascular Ring Anomalies|vascular ring anomalies]], [[Oesophagitis|oesophagitis]] and intraluminal and extraluminal masses. This can be done with plain and contrast radiography, endoscopy and ultrasonography.