CT
Right ear:
anotia: grade 4 (Marx classification 1); Absence of auricle.
external auditory canal atresia: Atresia bony plate at the medial part (type B Weerda classification). Expanded external auditory canal with soft tissue seen within.
middle ear/tympanic cavity is normal in size; Complete opacification of tympanic cavity. Soft tissue may represent cerumen/wax.
ossicles anomalies: moderate dysplastic malleus and incus (absence of manubrium of malleus and long process of incus adhered to the posterior wall; normal stapes is not visualised at the oval window
mastoid pneumatisation: absent (underpneumatization).
facial nerve course: abnormal course with anterior displacement of mastoid segment. Tympanic and mastoid segments are small in calibre. Tympanic segment is eroded.
oval and round windows: oval window is atretic. Normal round window.
vascular anomalies: no aberrant internal carotid artery; no high riding jugular bulb
Inner ear: normal.
Left ear:
microtia: grade 2 (Marx classification 1); Some normal features are present but upper ear is severely deficient.
external auditory canal :Stenotic. Tympanic membrane is thickened.
middle ear/tympanic cavity is normal in size.
ossicles anomalies: Absence of stapes and long process of incus.
mastoid pneumatisation: Reduced.
facial nerve course: abnormal course with anterior displacement of mastoid segment (same level as round window)
oval and round windows: Oval window is atretic. Round window is open
vascular anomalies: no aberrant internal carotid artery; no high riding jugular bulb
Inner ear: normal