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Figure 2: Preoperative 3D-CTA image and the corresponding intraoperative photography (inlets a and b). (a) The BBA was clipped using a right-angled clip. The accessory ACA origin was dilated and we found that it was the ruptured aneurysm. (b) BBA reclipped after avulsion using miniclip, the accessory ACA and aneurysm was clipped by another clip. *: accessory ACA origin, **: Acom, ***: aneurysm of the accessory ACA, short arrow: residual, swollen portion after obliteration of accessory ACA origin, long arrow: dimpling of A1-A2 junction, presumed position of BBA, curved arrow: accessory ACA

Figure 2: Preoperative 3D-CTA image and the corresponding intraoperative photography (inlets a and b). (a) The BBA was clipped using a right-angled clip. The accessory ACA origin was dilated and we found that it was the ruptured aneurysm. (b) BBA reclipped after avulsion using miniclip, the accessory ACA and aneurysm was clipped by another clip. *: accessory ACA origin, **: Acom, ***: aneurysm of the accessory ACA, short arrow: residual, swollen portion after obliteration of accessory ACA origin, long arrow: dimpling of A1-A2 junction, presumed position of BBA, curved arrow: accessory ACA