Table 1 Frequencies of variations of the sphenoid sinus and associated structures on right and left side
Right | Left | ||||
|---|---|---|---|---|---|
n | % | n | % | ||
SSS type | Pre-sellar | 11 | 4.2 | 13 | 5.0 |
Sellar | 43 | 16.4 | 39 | 14.9 | |
Post-sellar | 208 | 79.4 | 210 | 80.2 | |
SSC type | Pre-Vidian | 124 | 47.3 | 116 | 44.3 |
İntercanal | 55 | 21.0 | 62 | 23.7 | |
Post-rotundum | 83 | 31.7 | 84 | 32.1 | |
VC | Completely within the SS | 23 | 8.8 | 27 | 10.3 |
On the floor or partially protruding into the SS | 116 | 44.3 | 112 | 42.7 | |
Completely embedded in the SC | 123 | 46.9 | 123 | 46.9 | |
OC type | No indentation | 38 | 14.5 | 39 | 15.1 |
Indentation to SS wall | 120 | 45.8 | 119 | 45.9 | |
Protrudation to SS wall | 67 | 25.6 | 67 | 25.9 | |
Laterally to the SS and PEC | 37 | 14.1 | 34 | 13.1 | |
CC type | No indentation | 97 | 37.6 | 98 | 38.0 |
Indentation to SS wall | 98 | 38.0 | 97 | 37.6 | |
Protrudation to SS wall | 63 | 24.4 | 63 | 24.4 | |