CTA Study of Ruptured Aneurysms of the Posterior Communicating Artery

Figure 2

CTA-based measurement parameters are as follows: (a) No. 1 is the height of the aneurysm, No. 2 is the width of the aneurysm, and No. 3 is the width of the aneurysmal neck; (b) No. 4 is the diameter of the intradural ICA at its origin, No. 5 is the diameter of the ICA at its termination, and No. 6 is the diameter of the MCA at its origin; (c) No. 7 is the diameter of the PcomA at its origin, No. 8 is the diameter of the PcomA at its termination, No. 9 is the diameter of P2 at its origin, and No. 10 is the diameter of P1 at its termination; (d) No. 11 is the length of the intradural ICA, No. 12 is the length of the PcomA, and No. 13 is the angle between the ICA and the PcomA. Abbreviations: CTA: computed tomography angiography; ICA: internal carotid artery; MCA: middle cerebral artery; PCA: posterior cerebral artery; PcomA: posterior communicating artery; P1: first segment of PCA.

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