Head and Neck – Flashcard #2

What do you see on the following images?

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Dehiscent jugular bulb

The jugular bulb bulges into the left middle ear cavity with absence of the sigmoid plate separating the jugular bulb from the middle ear in keeping with dehiscent jugular bulb.

It is one of the causes of pulsatile tinnitus, patients can also present with conductive hearing loss if the jugular vein contacts the tympanic membrane.

Head and Neck – Flashcard #1

Axial CT bone window

What do you see on this image?

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Otosclerosis

There is a small lucency anterior to the vestibule, just lateral to the basal turn of the cochlea. Consistent with fenestral otosclerosis.

There are two types of otosclerosis:

1- Fenestral: is the most common type. It involves the bone anterior to the oval window and causes conductive hearing loss.
2- Retro-fenestral: involves the cochlear capsule and causes sensorineural hearing loss.
The two types can occur simultaneously.