pseudoaneurysm


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pseudoaneurysm

 [soo″do-an´u-rizm]
a condition resembling an aneurysm, but due to dilation or tortuosity of a vessel. Called also false or spurious aneurysm.

pseu·do·an·eu·rysm

(sū'dō-an'yū-rizm),
1. Pulsating, encapsulated hematoma in communication with the lumen of a ruptured vessel.
2. Ventricular pseudoaneurysm, a cardiac rupture contained and loculated by pericardium, which forms its external wall.
3. An aneurysm the walls of which consist of adventitia and periarterial fibrous tissue and hematoma.

pseudoaneurysm

/pseu·do·an·eu·rysm/ (-an´ūr-izm) false aneurysm; dilatation or tortuosity of a vessel, giving the appearance of an aneurysm.

pseudoaneurysm

[-an′yəriz′əm]
1 a dilation of an artery caused by damage to one or more layers of the artery as a result of arterial trauma or rupture of a true aneurysm.
2 a tortuosity of a blood vessel or cavity resulting from a herniated infarction. Also called pulsatile hematoma.

pseudoaneurysm

The preferred term for a false aneurysm in which the saccular dilation (“aneurysm”) does not involve all of the vessel wall layers.

Pseudoaneurysm should not be confused with phantom aneurysm (also known as aortismus abdominalis), a near-extinct term for the clinical misinterpretation of the (normal) aortic pulse as a sign of an abdominal aortic aneurysm, an error usually borne of inexperience.

pseudoaneurysm

False aneurysm, see there.

false an·eu·rysm

(fawls an'yŭr-izm)
1. Pulsating, encapsulated hematoma in communication with the lumen of a ruptured vessel;
2. Ventricular pseudoaneurysm, a cardiac rupture contained and loculated by pericardium, which forms its external wall.
3. An aneurysm with walls that consist of adventitia, periarterial fibrous tissue, and hematoma.

pseudoaneurysm

false aneurysm; differs from a true aneurysm in that its wall does not contain the components of an artery, but consists of fibrous tissue, which usually continues to enlarge, creating a pulsating hematoma.
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A contrast-enhanced CT scan of the abdomen and pelvis was carried out and revealed the presence of a 3 cm right pelvic pseudoaneurysm (Figure 1).
Since the arterial system runs on the increased pressure principle, the risk of developing an arteriovenous fistula (blood flowing from injured arteries' high pressure towards adjacent injured vein) or pseudoaneurysm (blood pooling under parenchyma) is relatively high.
Pseudoaneurysm formation in a dialysis access occurs when the access wall is completely destroyed due to multiple cannulations in the same area (commonly seen in graft), when the needle pierces the back or side wall of the vessels, accidentally allowing blood to extravasate, and sometimes can also occur when the needle site is not held appropriately after needle removal--for example, the person is holding the skin insertion site but not putting pressure on the vessel insertion site.