Table II.
Relation between the type of Onodi cell and type of sphenoid sinus on 430 paranasal sinus CT scans.
| Sellar N (%) | Presellar N (%) | Conchal N (%) | Postsellar N (%) | Total | |||||
|---|---|---|---|---|---|---|---|---|---|
| R-Onodi cell | 20/33 (60.6) | 4/33 (12.1) | - | 9/33 (27.3) | 33/93 (35.5) | ||||
| Type I | 9/20 (45.0) | 2/4 (50.0) | 5/9 (55.6) | ||||||
| Type II | 8/20 (40.0) | 2/4 (50.0) | 1/9 (11.1) | ||||||
| Type III | 3/20 (15.0) | - | 3/9 (33.3) | ||||||
| L-Onodi cell | 23/35 (65.7) | 4/35 (11.4) | 1/35 (2.9) | 7/35 (20.0) | 35/93 (37.6) | ||||
| Type I | 14/23 (60.9) | 3/4 (75.0) | 1/1 (100.0) | 1/7 (14.3) | |||||
| Type II | 4/23 (17.4) | 1/4 (25.0) | - | 4/7 (57.1) | |||||
| Type III | 5/23 (21.7) | - | - | 2/7 (28.6) | |||||
| B-Onodi cell | R | L | R | L | R | L | R | L | |
| 13/25* (52.0) | 14/25* (56.0) | 3/25* (12.0) | 2/25* (8.0) | 3/25* (12.0) | 5/25* (20.0) | 6/25* (24.0) | 4/25* (16.0) | 25*/93 (26.9) | |
| Type I | 11/13 (84.6) | 12/14 (85.7) | 2/3 (66.7) | 1/2 (50.0) | 2/3 (66.7) | 1/5 (20.0) | 4/6 (66.7) | 2/4 (50.0) | |
| Type II | 2/13 (15.4) | - | 1/3 (33.3) | 1/2 (50.0) | - | 4/5 (80.0) | - | 2/4 (50.0) | |
| Type III | - | 2/14 (14.3) | - | - | 1/3 (33.3) | - | 2/6 (33.3) | - | |
| Total | 93/430 (21.6) | ||||||||
| R: right; L: left; B: bilateral. | |||||||||
| * (25*) This refers to the total number of patients with bilateral OC (in total 50 OC in this group). | |||||||||