FIG 1. Construction of the wide neck aneurysm model.

A, Artistic representation of the preparation of arterial and venous components.

B, Construction of the Y-type carotid bifurcation model.

C, Wide neck aneurysm model. To obtain a wide neck incorporating the origin of the left branch (left carotid artery), the distance between the proximal and distal contact points of the left and right carotid arteries is reduced to 0 (see text for details).

D, Intraoperative photograph of the resulting wide neck aneurysm model.

E, Angiogram of the carotid artery, obtained immediately after surgery.