Figure 1 Normal temporal bone on high-resolution CT
a, b. Transverse CT shows 1. Internal auditory canal; 2. Labyrinthine segment of facial nerve canal; 3. Vestibule; 4. Epitympanum; 5. Lateral semicircular canal; 6. Mastoid antrum; 7. Posterior semicircular canal; 8. Vestibular aqueduct; 9. Sigmoid sinus; 10. Cochlea; 11. Tympanic segment of facial nerve canal; 12. Malleus; 13. Epitympanum; 14. Incus; 15. Vestibule; 16. Posterior semicircular canal; 17. Internal auditory canal; 18. Mastoid pneumatization; 19. Sigmoid sinus.
c, d. Coronal CT shows 20. Cochlea; 21. Geniculate ganglion of facial nerve; 22. Auditory ossicles; 23. Tympanic membrane; 24. Internal carotid artery canal; 25. Superior semicircular canal; 26. Epitympanum; 27. Lateral semicircular canal; 28. Scutum; 29. External auditory canal; 30. Auditory ossicles; 31. Oval window; 32. Posterior semicircular canal; 33. Internal auditory canal.
Figure 2 Cochlear x-ray
Figure 3 Coronal temporal bone CT cochlear level
a, Mastoid; b, Stapes; c, Cochlea; d, Epitympanum
Figure 4 Coronal temporal bone CT vestibular level
a, External auditory canal; b, Basal turn of cochlea; c, Internal auditory canal; d, Lateral semicircular canal; e, Aditus to tympanic antrum
Figure 5 Coronal temporal bone CT mastoid level
a, Mastoid pneumatization; b, Styloid process; c, Mastoid segment of facial nerve; d, Tympanic antrum
Figure 6 Axial temporal bone CT vestibular level
a, Incus body; b, Head of malleus; c, Anterior superior tympanic cavity; d, Tympanic segment of facial nerve; e, Geniculate ganglion, greater superficial petrosal nerve; f, Carotid artery; g, Cochlea; h, Vestibule; i, Vestibular aqueduct; j, Lateral semicircular canal; k, Posterior semicircular canal; l, Tympanic antrum
Figure 7 Axial temporal bone CT cochlear level
a, Mandibular condyle; b, Handle of malleus; c, Long process of incus; d, Facial recess; e, Pyramidal segment of facial nerve; f, Posterior semicircular canal; g, Stapes; h, Round window niche; i, Basal turn of cochlea; j, Tensor tympani; k, Carotid canal
Figure 8 Axial temporal bone CT mastoid level
a, Eustachian tube; b, External auditory canal; c, Middle ear cavity; d, Sigmoid sinus; e, Mastoid pneumatization; f, Mastoid segment of facial nerve; g, Jugular bulb; h, Ascending segment of carotid artery; i, Cochlear aqueduct; j, Jugular foramen; k, Petrous apex
Figure 9 Internal auditory canal on MRI
a, Cochlear nerve; b, Inferior branch of vestibular nerve; c, Superior branch of vestibular nerve; d, Facial nerve
Figure 10 Inner ear MRI with gadolinium contrast agent
A and D are normal endolymph, and B, E, C, and F are endolymphatic hydrops