Blood blister-like aneurysm

Blood blister-like aneurysm is a broad based bulge at non-branch point of a vessel.

Middle-aged patients with subarachnoid haemorrhage.

Focal arterial wall defect covered with fibrous tissue.

  • shape: blood blister-like or half-domed shallow outpouching with wide neck
  • common sites: supraclinoid ICA (dorsal wall), less likely MCA, ACA, basilar artery
  • size: usually small (<6 mm) with a mean of 3 mm 1
  • rapid change in size and morphology on follow-up angiograms
  • CT angiography: often negative
  • digital subtraction angiography: is the best diagnostic tool

These aneurysms are difficult to treat:

  • endovascular coiling is difficult secondary to its small size and wide neck
  • surgical clipping/wrapping is at high risk of rupture of the aneurysm or internal carotid laceration during surgery
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Article information

rID: 47875
Section: Pathology
Tag: cases
Synonyms or Alternate Spellings:
  • Small saccular aneurysm
  • Tiny saccular aneurysm

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