Source:http://linkedlifedata.com/resource/umls/id/C1510412
MSH: Not an aneurysm but a well-defined collection of blood and CONNECTIVE TISSUE outside the wall of a blood vessel or the heart. It is the containment of a ruptured blood vessel or heart, such as sealing a rupture of the left ventricle. False aneurysm is formed by organized THROMBUS and HEMATOMA in surrounding tissue.,NCI: The creation of hematoma outside the arterial wall following bleeding due to puncture of the arterial wall. Pseudoaneurysms can also occur in the heart chambers following myocardial infarction and bleeding.