Table 2.
Ear structure observations
| Structure on CT | Normal | Abnormal | UTI |
|---|---|---|---|
| Pneumatisation mastoid | Good | No cells | UTI |
| 73 (87 %) | 7 (8 %) | 4 (5 %) | |
| Middle ear cavity size | Normal | Small/large | UTI |
| 84 (100 %) | 0 | 0 | |
| Jugular bulb | Normal | High | UTI |
| 59 (70 %) | 23 (27 %) | 2 (2 %) | |
| Emissary veins | Total | >1 mm | PSS |
| 28 (33 %) | 25 (30 %) | 11 (13 %) | |
| Windows | Present | Absent/stenotic | UTI |
| Oval | 22 (26 %) | 60 (71 %) | 2 (2 %) |
| Round | 70 (83 %) | 12 (14 %) | 2 (2 %) |
| Ossicles | Normal | Dysplastic | UTI |
| Malleus | 83 (99 %) | 1 (1 %) | 0 |
| Incus | 75 (89 %) | 9 (11 %) | 0 |
| Stapes | 27 (32 %) | 42 (50 %) | 13 (15 %) |
| Facial nerve | Normal | Aberrant course | UTI |
| Tympanic | 54 (64 %) | 24 (29 %) | 6 (7 %) |
| Mastoid | 70 (83 %) | 6 (7 %) | 8 (10 %) |
| Vestibular aqueduct | Normal | Aberrant course | UTI |
| 12 (14 %) | 57 (68 %) | 12 (14 %) | |
| Cochlear apertura | Normal | Stenotic | UTI |
| 51 (61 %) | 31 (37 %) | 2 (2, 4 %) | |
| SCC | Normal | Aplastic | Dysplastic |
| 2 (2 %) | 65 (77 %) | 17 (20 %) |
Number of ears: 84
UTI unable to identify; PPS persistent petrosquamosal sinus, SCC semicircular canals