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===Introduction===
* An embolus is a detached intravascular mass that is carried by the blood to a site distant from its point of origin.
* An embolus is a detached intravascular mass that is carried by the blood to a site distant from its point of origin.
** May be solid or gaseous.
** May be solid or gaseous.
===Types of Embolism===
===Types of Embolism===
====Thromboembolism====
====[[Thromboembolism]]====
* These are pieces of thrombi that have broken away from their primary site.
* These are pieces of thrombi that have broken away from their primary site.
====Tumour emboli====
====Tumour emboli====
[[Image:Sarcoma embolus.jpg|thumb|right|200px|<small><center><b>Sarcoma embolus (dog)</b>. Courtesy of T. Scase</center></small>]]
* Otherwise known as [[Neoplasia - Pathology#Dissemination of malignant neoplasia|metastasis]].
* Otherwise known as [[Neoplasia - Pathology#Dissemination of malignant neoplasia|metastasis]].
* Small groups of tumour cells may break off and be carried in vessels to reach another site
* Small groups of tumour cells may break off and be carried in vessels to reach another site
*#*** Occlusion of vessels to a tissue with an end arterial supply will cause '''ischaemic necrosis''' or '''infarction'''.
*#*** Occlusion of vessels to a tissue with an end arterial supply will cause '''ischaemic necrosis''' or '''infarction'''.
====[[Ischaemia and Infarction - Pathology#Ischaemia|Ischaemia]]====
====[[Ischaemia|Ischaemia]]====
* This is the local reduction of blood flow to an area.
* This is the local reduction of blood flow to an area.
** Results in hypoxia and atrophy of the tissue supplied.
** Results in hypoxia and atrophy of the tissue supplied.
====[[Ischaemia and Infarction - Pathology#Infarction|Infarction]]====
====[[Infarction|Infarction]]====
* Blockage of an end artery results in acute ischaemic coagulation necrosis, or infarction.
* Blockage of an end artery results in acute ischaemic coagulation necrosis, or infarction.
=====Lungs=====
=====Lungs=====
* Emboli from the venous system may end up in the [[Lungs Circulatory - Pathology#Embolism, thrombosis and infarction|lung]].
* Emboli from the venous system may end up in the [[Pulmonary Embolism, Thrombosis and Infarction|lung]].
* The lung has an extensive collateral cirulcation, and so little damage is caused.
* The lung has an extensive collateral cirulcation, and so little damage is caused.
[[Category:Arterial_Pathology]][[Category:Venous_Pathology]]
[[Category:Arterial_Pathology]][[Category:Venous_Pathology]]
[[Category:General_Pathology]]
[[Category:Circulatory Disorders - Pathology]][[Category:To Do - Cardiovascular]]
[[Category:Cardiology Section]]