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Ruptured berry aneurysm

Rupture of a berry aneurysm (also known as a saccular aneurysm) can cause either a subarachnoid haemorrhage, cerebral hematoma and/or an intraventricular haemorrhage.


Berry aneurysms form 97% of aneurysms of the central nervous system. Up to 80% of patients with a spontaneous subarachnoid haemorrhage have ruptured an aneurysm. 90% of these aneurysms are located in the anterior circulation (carotid) and 10% are found in the posterior circulation (vertebrobasilar).

Determining the site of rupture

After rupture, the location of the blood or haematoma can help determine the site of the ruptured aneurysm in the majority of cases:

  • ACOM: ~35%, septum pellucidum, interhemispheric fissure & intra-ventricular
  • PCOM: ~35%, sylvian fissure
  • MCA: ~20%, temporal lobe, Sylvian fissure & intra-ventricular
  • basilar: ~5%, prepontine cistern
  • ICA: Sylvian fissure and intra-ventricular
  • pericallosal artery: corpus callosum
  • PICA: foramen magnum

See also

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