Table 1 Variations of the study
Type | No. of cases | Percent |
|---|---|---|
ET orifice conformation | ||
Type A: Quadrangular | 160 | 64% |
Type B: Triangular | 90 | 36% |
Subtensor recess | ||
Type A: Flat | 78 | 31.2% |
Type B: Shallow | 162 | 64.8% |
Type C: Deep | 10 | 4% |
Protiniculum | ||
Type A: Ridge | 200 | 80% |
Type B: Bridge | 6 | 2.4% |
Type C: Absent | 44 | 17.6% |
Jugular bulb | ||
Type A: Below the level of bony annulus | 189 | 75.6% |
Type B: At the level of bony annulus | 56 | 22.4% |
Type C: Above the level of bony annulus | 5 | 2% |
Ponticulus | ||
Type A: Ridge | 221 | 88.4% |
Type B: Bridge | 9 | 3.6% |
Type C: Incomplete | 20 | 8% |
Subiculum | ||
Type A: Ridge | 162 | 64.8% |
Type B: Bridge | 13 | 5.2% |
Type C: Incomplete | 75 | 30% |
Finiculus | ||
Type A: Ridge | 182 | 72.8% |
Type B: Bridge | 9 | 3.6% |
Type C: Incomplete | 59 | 23.6% |
Sinus Tympani | ||
Type A: Shallow | 86 | 34.4% |
Type B: Deep | 134 | 53.6% |
Type C: Extends significantly postero- medial to facial nerve | 30 | 12% |
Fustis direction/subcochlear canaliculus | ||
Type A: Oblique fustis with existing canaliculus | 203 | 81.2% |
Type B: Transverse fustis with absent canaliculus | 47 | 18.8% |
Round window false membrane | ||
Type A: Present | 64 | 25.6% |
Type B: Absent | 186 | 74.4% |