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Table 2: 
Aneurysm and PAE contour deformations
Group 1Group 2
No. of aneurysms with contact with bone or dura324
Contour deformation of the aneurysm20 (62.5%)2 (50%)
Deformation of the PAE by aneurysm (bone erosion)5 (15.6%)2 (50%)
Location
    PcomA9 (45%)—
    AcomA5 (25%)—
    ICA/ophthalmic1 (5%)2 (100%)
    ICA C1/C21 (5%)—
    MCA3 (15%)—
    PCA P1/P21 (5%)—
  • Note:—PAE indicates perianeurysmal environment; PcomA, posterior communicating artery; AcomA, anterior communicating artery; ICA, internal carotid artery; MCA, middle cerebral artery; PCA, posterior cerebral artery.