Table 3.

Prevalence of paranasal sinus variations

	Frontal type 1 (n = 24)	Frontal type 2 (n = 24)	Frontal type 3 (n = 52)	Total (n = 100)	p value
Nasal turbinates pneumatization
Upper concha pneumatization
Present	3 (12.5%)	4 (16.7%)	11 (21.2%)	18 (18%)	0.646
Absent	21 (87.5%)	20 (83.3%)	41 (81.8%)	82 (82%)
Middle concha pneumatization
Present	8 (33.3%)	15 (62.5%)	28 (53.8%)	51 (51%)	0.108
Absent	16 (66.7%)	9 (37.5%)	24 (46.2%)	49 (49%)
Agger Nasi Cell
Present	21 (87.5%)	20 (83.3%)	48 (92.3%)	89 (89%)	0.49
Absent	3 (12.5%)	4 (16.7%)	4 (7.7%)	11 (11%)
Haller cell
Present	1 (4.2%)	1 (4.2%)	3 (5.8%)	5 (5%)	0.934
Absent	23 (95.8%)	23 (95.8%)	49 (94.2%)	95 (95%)
Onodi cell
Present	3 (12.5%)	6 (25.0%)	22 (42.3%)	31 (31%)	0.025
Absent	21 (87.5%)	18 (75%)	30 (57.7%)	69 (69%)
Maxillary sinus hypoplasia
Present	1 (4.2%)	1 (4.2%)	1 (1.9%)	3 (3%)	0.805
Absent	23 (95.8%)	23 (95.8%)	51 (98.1%)	97 (97%)
Sphenoid sinus pneumatization
Presellar	1 (4.2%)	1 (4.2%)	3 (5.8%)	5 (5%)	0.934
Sellar	23 (95.8%)	23 (95.8%)	49 (94.2%)	95 (95%)
Accessory pneumatization variants of sphenoid sinus
Anterior clinoid process pneumatization
Present	3 (12.5%)	2 (8.3%)	18 (34.6%)	23 (23%)	0.015
Absent	21 (87.5%)	22 (91.7%)	34 (65.4%)	77 (77%)
Pterygoid process pneumatization
Present	6 (25%)	5 (20.8%)	22 (42.3%)	33 (33%)	0.114
Absent	18 (75%)	19 (79.2%)	30 (57.7%)	67 (67%)
Greater wing of sphenoid pneumatization
Present	4 (16.7%)	2 (8.3%)	19 (36.5%)	25 (25%)	0.017
Absent	20 (83.3%)	22 (91.7%)	33 (63.5%)	75 (75%)
Optic nerve types
Type 1	17 (70.8%)	19 (79.2%)	22 (42.3%)	58	0.026
Type 2	5 (20.8%)	2 (8.3%)	10 (19.2%)	17
Type 3	1 (4.2%)	2 (8.3%)	10 (19.2%)	13
Type 4	1 (4.2%)	1 (4.2%)	10 (19.2%)	12
ICA dehiscence or protrusion
Present	1 (4.2%)	2 (8.3%)	12 (23.1%)	15 (15%)	0.057
Absent	23 (95.8%)	22 (91.7%)	40 (76.9%)	85 (85%)