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A–D, 2D reformations of a bifurcation aneurysm in the coronal (A) and sagittal (B) planes with corresponding axial image at the ostium (C) and a DSA (D) (dashed lines indicate the limit of the ostium; BA, bifurcation aneurysm; PA, parent artery; RCa, right carotid artery; LCa, left carotid artery; Os, ostium; asterisk denotes the intravascular sonographic catheter)
