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Figure 1: (a) Computed tomographic angiography (anterior/right lateral view) illustrates a trilobar anterior communicating artery aneurysm (white arrow), (b) computed tomographic angiography (left lateral view) shows the left A1-A2 angulation (white arrow), and (c) computed tomographic angiography (inferior view) illustrates the relation of the left A1-A2 junction to the anterior communicating artery aneurysm (white arrow)

Figure 1: (a) Computed tomographic angiography (anterior/right lateral view) illustrates a trilobar anterior communicating artery aneurysm (white arrow), (b) computed tomographic angiography (left lateral view) shows the left A1-A2 angulation (white arrow), and (c) computed tomographic angiography (inferior view) illustrates the relation of the left A1-A2 junction to the anterior communicating artery aneurysm (white arrow)