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Figure 1: DSA with 3D reconstruction: Right vertebral artery supplying bilateral anterior (a) and middle cerebral arteries (curved arrows in (b)), through pcomm arteries [thick arrows in (b)]. Double arrow and empty arrow in (b) denoting the right posterior cerebral artery (PCA) and left PCA, respectively. Aneurysms at the basilar tip and left P1 PCA–pcomm junction [thin arrows in (b)]. Hypoplastic right ICA (c) with corresponding hypoplastic right carotid canal (d). Hypoplastic left ICA (f) with corresponding hypoplastic left carotid canal (e)

Figure 1: DSA with 3D reconstruction: Right vertebral artery supplying bilateral anterior (a) and middle cerebral arteries (curved arrows in (b)), through pcomm arteries [thick arrows in (b)]. Double arrow and empty arrow in (b) denoting the right posterior cerebral artery (PCA) and left PCA, respectively. Aneurysms at the basilar tip and left P1 PCA–pcomm junction [thin arrows in (b)]. Hypoplastic right ICA (c) with corresponding hypoplastic right carotid canal (d). Hypoplastic left ICA (f) with corresponding hypoplastic left carotid canal (e)