Table 1.

Windows around the optic chiasm: the window between the optic nerves is mostly addressed as prechiasmatic (25, 26) or IO (27) window and the window lateral to the carotid artery as the carotidosylvian (27), carotidotemporal (28), retrocarotid (29), or carotidotentorial (25) window.

References	Window 1	Window 2	Window 3	Window 4	Window 5
Yaşargil et al. (25)	Prechiasmatic	Opticocarotid	Carotidotentorial	Lamina terminalis	x
Koos et al. (27)	interoptic	Opticocarotid	Carotidosylvian	Lamina terminalis	x
Tanaka et al. (29)	x	Opticocarotid	Retrocarotid (medial, lateral)	x	x
Honegger and Tatagiba (26)	Prechiasmatic	Opticocarotid	Lateral to carotid artery	Lamina terminalis	Tuberculum sellae
Metwali et al. (28)	Subchiasmatic	Opticocarotid	Carotidotemporal	x	x
Cikla et al. (30)	Subchiasmatic	Opticocarotid	x	Lamina terminalis	x

Tanaka et al. (29) subclassified the retrocarotid window in the medial retrocarotid space between the ICA and the PCOA, and the lateral retrocarotid space between the PCOA and the oculomotor nerve, which might be used for the surgical management of BA bifurcation aneurysms.