Table 3 Prevalence of ICA/ONC protrusion and dehiscence and PRP by sphenoid pneumatization
From: Risky anatomical variations of sphenoid sinus and surrounding structures in endoscopic sinus surgery
Sphenoid pneumatization n (%) | Right ICA | Right ONC | Right PRP SS n (%)§ | ||||
Normal n (%)§ | Protrusion n (%)§ | Dehiscence n (%)§ | Normal n (%)§ | Protrusion n (%)§ | Dehiscence n (%)§ | ||
Sellar 127 (55.2) | 90 (70.9) | 34 (26.8) | – | 101 (79.5) | 21 (16.5) | 3 (2.4) | 13 (10.2) |
Presellar 69 (30) | 58 (84.1) | 11 (15.9) | – | 63 (91.3) | 3 (4.3) | 2 (2.9) | 7 (10.1) |
Conchal 21 (9.1) | 17 (80.9) | 4 (19.0) | – | 19 (90.5) | 2 (9.5) | – | – |
Postsellar 13 (5.7) | 8 (61.5) | 5 (38.5) | – | 10 (76.9) | 2 (15.4) | – | – |
Total 230 (100) | 173 (75.2) | 54 (23.5) | – | 193 (83.9) | 28 (12.2) | 5 (2.2) | 20 (8.7) |
Left ICA | Left ONC | Left PRP SS n (%)§ | |||||
Normal n (%)§** | Protrusion n (%)§* | Dehiscence n (%)§ | Normal n (%)§ | Protrusion n (%)§ | Dehiscence n (%)§ | ||
Sellar 143 (62.2) | 94 (65.7) | 49 (34.3) | 2 (1.4) | 115 (80.4) | 22 (15.4) | 2 (1.4) | 18 (12.6) |
Presellar 56 (24.3) | 47 (83.9) | 9 (16.1) | – | 49 (87.5) | 6 (10.7) | – | 6 (10.7) |
Conchal 18 (7.8) | 16 (88.9) | 2 (11.1) | – | 17 (94.4) | 1 (5.6) | – | 1 (5.6) |
Postsellar 13 (5.7) | 6 (46.1) | 7 (53.8) | – | 10 (76.9) | 3 (23.1) | – | 2 (15.4) |
Total 230 (100%) | 159 (69.1) | 67 (29.1) | 2 (0.9) | 191 (83.0) | 32 (13.9) | 2 (0.9) | 27 (11.7) |