Radiology in Audiology From Lectures of Dr. Dr Mamdouh Mahfouz

CT Scan of different ear parts:

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a) Outer ear:

Scutum of TM

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b) Middle Ear:

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a. Ice cream cone b. Aditus Ad Antrum

a

b

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-

E. Tube Malleus Incus

 Incus

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yramid

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3 2

Middle  Level if ice cream cone

Below  Level of Sea lion

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More Superior Axial Section

Tegmen Tympani level

Ice cone level

Sea Lion level

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& Jugular Bulb Dehiscence

IAC

Transverse septum

SSC

LSC

Cochlea

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FN

OW

***Facial n. Dehiscence is another frequent anomaly

Axial Section

Snake eye L

T

Coronal section

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c) Inner ear:

PSCC

NB: Lateral Semicircular canal is at ice cream cone level

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vestibule

PSCC LSCC

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Round window

Basal Turn

1 ½ Turn

Apex or Dome

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Auditory n.

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Cochlear Aqueduct

Enlarged VA

IAC

Normal VA

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Tympanic segment GG

Ascending Labyrinthine segment

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Nerves inside IAC: 1. Facial n 2. Cochlear n. 3. Superior vestibular n. 4. Inferior vestibular n. 5. Greater petrosal n. from Facial n. (not appear by MRI)

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(MRI Sagittal T2 Section)

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Some Pathological Radiological Findings: a. External Ear pathologies:

To differentiate between:   

Presence or absence of Ext ear Soft tissue or bony atresia Middle ear anomalies accompanying Ext ear anomalies.

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Ext ear Atresia + Fused ossicles with each other & with inner wall of Middle ear cavity

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OM differentiated from cholesteatoma by fluid level with change its position by different positions which not occur in cholesteatoma

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Retracted TM  indicates Chronicity

(Not proceeded by OM)

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GT: Enhanced by MRI with contrast

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Inner ear :

MRI

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MRI inner ear

(no inner ear) Cochlear anomalies

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Best Regards

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