False aneurysm

False aneurysms, also known as a pseudoaneurysm, is when there is a breach in the vessel wall such that blood leaks through the wall but is contained by the adventitia or surrounding perivascular soft tissue. A direct communication of blood flow exists between the vessel lumen and the aneurysm lumen through the hole in the vessel wall. The risk of rupture is higher than that of a true aneurysm of comparable size due to poor support of the aneurysm wall and thus false aneurysms generally require treatment.

Causes
Location

They can involve any arterial segment or even a cardiac chamber. Examples include

Some of the imaging features may be dependent on location.

Ultrasound

Due to the turbulent forward and backward flow, a characteristic yin-yang sign may be seen on colour flow while a "to and fro" pattern may be seen with pulsed Doppler.

CT
  • hypoattenuating (non-contrast) or hyperattenuating contrast-enhanced) smooth walled sac adjacent to an artery, usually with a communication 6
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Article Information

rID: 1326
System: Vascular
Section: Pathology
Synonyms or Alternate Spellings:
  • Pseudoaneurysm
  • Pulsatile haematoma
  • Communicating haematoma
  • Pseudoaneurysms
  • False aneurysms

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    Figure 1: diagram - false aneurysm
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    Case 1: gastroduodenal artery pseudoaneurysm
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    Case 2: right femoral
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    Case 3: common carotid pseudoaneurysm
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    CT Angiogram show...
    Case 4: radial artery
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    ct carotid axial
    Case 5: carotid artery pseudoaneurysm
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    Case 6: left ventricular pseudo-aneurysm
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    Case 7
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    In short segment ...
    Case 9
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    Case 10
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    fairly large pseu...
    Case 11: hepatic artery pseudoaneurysm
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    Case 12: carotid arterial pseudoaneurysm
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    Cine
    Case 13: aortic root pseudoaneurysm
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    Case 14: brachiocephalic arterial pseudoaneurysm
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    Case 15: post renal transplant
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    Icon video thumb
    Case 15: on ultrasound (video)
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    Case 16: traumatic - small
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    Case 17: renal arterial pseudonaeurysm
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    Case 18: gastroduodenal artery pseudo-aneurysm
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    Case 19: radial artery pseudoaneurysm
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