Bleeding patterns in ruptured posterior fossa aneurysms: A ct study

Norihiro Sadato, Yuji Numaguchi, Daniele Rigamonti, Michael Salcman, Fouad Gellad, Takashi Kishikawa

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Computed tomography of the brains in 20 patients with acute rupture of posterior fossa aneurysms was reviewed and analyzed retrospectively. Find-ings were compared with those from 44 cases described in the literature and with the findings in ruptured supratentorial aneurysms. Extravasated blood was observed in 19 of 20 patients (95%); intraventricular hemorrhage (IVH) in 17 of 20 (85%); and subarachnoid hemorrhage (SAH) in 13 of 20 (65%). These values were significantly higher than those previously reported and suggest that, during the acute phase of rupture, extravasated blood may be detected with the same frequency in either infratentorial or supratentorial ruptured aneurysms. Subarachnoid hemorrhage was accompanied by IVH, prominent in the fourth ventricle and without intraparenchymal hematoma, in 11 patients (55%). This pattern is highly suggestive of ruptured posterior fossa aneurysms. Intraventricular hemorrhage without SAH was noted in five patients (25%) and specifically represented ruptured posterior inferior cerebellar artery aneurysms. Subarachnoid hemorrhage without IVH was noted in only two patients (10%).

Original languageEnglish (US)
Number of pages1
JournalJournal of computer assisted tomography
Issue number4
StatePublished - Jul 1991
Externally publishedYes


  • Brain aneurysm
  • Computed tomography
  • Posterior fossa aneurysm
  • Subarachnoid space hemorrhage

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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