Table 2.
Distribution of anatomical variation in the sphenoidal sinus, identified with CT scans among female participants.
| Anatomical variations in the sphenoidal sinus | Women (n = 400) |
|||||
|---|---|---|---|---|---|---|
| Cases n (%) |
Controls n (%) |
|||||
| (n = 200) |
(n = 200) |
|||||
| Absent | Unilateral | Bilateral | Absent | Unilateral | Bilateral | |
| Accessory sinus septa | 69 (34.0) | 34 (17.0) | 97 (48.5) | 128 (64.0) | 17 (8.5) | 55 (27.5) |
| ICA protrusion | 124 (62.0) | 7 (3.5) | 66 (33.0) | 158 (80.5) | 19 (9.5) | 21 (10.5) |
| ICA dehiscence | 137 (68.5) | 16 (8.0) | 47 (23.5) | 161 (80.5) | 26 (13.0) | 13 (16.5) |
| Optic nerve protrusion | 94 (47.0) | 11 (5.5) | 95 (47.5) | 140 (70.0) | 26 (13.0) | 33 (23.5) |
| Optic nerve dehiscence | 79 (39.5) | 32 (16.0) | 89 (44.5) | 117 (58.5) | 2 (1.0) | 81 (40.5) |
| ACP pneumatization | 120 (60.0) | 9 (4.5) | 70 (35.0) | 143 (71.5) | 4 (2.0) | 53 (26.5) |
The study groups were cases and controls. CT images were collected with a Siemens AG Somatom scanner and used to assess anatomical variation in the sphenoidal sinuses. Data are shown as frequencies (n) with percentages in parentheses (%). Abbreviations: ICA, internal carotid artery; ACP, anterior clinoid process; CT scan, computerized tomography scan; cases, patients with chronic rhinosinusitis; controls, healthy individuals without chronic rhinosinusitis.