Table 1. Characteristics of sphenoid sinuses (n=466)

Onodi cell (+)	217 (46.56%) of 466
Optic canal	124 (57.14%)
Sella	86 (39.63%)
Infrasella	7 (3.23%)

Accessory septa (+)	335 (71.89%) of 466
Total number	356
Mean number (per sphenoid sinus)	0.764