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These are uncommon, but are seen rarely in cats and dogs as a result of stasis in atrial appendages.
 
These are uncommon, but are seen rarely in cats and dogs as a result of stasis in atrial appendages.
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===Venous Thrombosis===
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====Venous Thrombosis====
====Description====
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Thrombus formation in the venous system occurs most commonly as the result of trauma, venous catheterisation, or neoplastic conditions.
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*Thrombus formation in the venous system occurs most commonly as the result of trauma, venous catheterisation, or neoplastic conditions.
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Obstruction of the affected area or embolisation of the thrombus to distant areas results in a variety of clinical signs.  As could be expected, the location of the insult determines the type of presenting signs.  For example, pulmonary emboli cause respiratory problems while portal vein thrombi result in ascites and the possible development of hepatic encephalopathy or portosystemic shunting.
 
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*Obstruction of the affected area or embolisation of the thrombus to distant areas results in a variety of clinical signs.  As could be expected, the location of the insult determines the type of presenting signs.  For example, pulmonary emboli cause respiratory problems while portal vein thrombi result in ascites and the possible development of hepatic encephalopathy or portosystemic shunting.
      
* Venous thrombosis is a fairly common type of thrombus in the veterinary species.
 
* Venous thrombosis is a fairly common type of thrombus in the veterinary species.
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