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30 Cards in this Set
- Front
- Back
Where is temporal bone fracture often first suspected?
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On head CT to rule out intracranial injury
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What are the findings suspicious for temporal bone fracture on head CT?
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1) Opacification of mastoid air cells
2) Pneumocephalus 3) Fluid in middle ear 4) Air in the bony labyrinth (rare) |
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What are temporal bone fractures classified by?
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Orientation, with respect to the orientation of the petrous portion of temporal bone
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What is the most common type of temporal bone fracture?
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That which parallels the long axis of the temporal bone, the longitudinal fracture
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What percent?
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80% of t-bone fractures
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How does it occur?
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blow to side of head
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Which type of t-bone fx is more severe?
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Transverse
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What are common sequelae of longitudinal t-bone fx?
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dislocation of ossicles, with resultant conductive hearing loss
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How does transverse fracture occur?
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Blow to frontal or occipital region
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What are common sequelae of longitudinal t-bone fxs?
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Sensorineural hearing loss
Severe vertigo Facial palsy |
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What percent have facial nerve injury?
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40%
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What other structure is often injured?
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Carotid or jugular
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Where do venous epidurals occur?
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Along dural venous sinus
|
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Where?
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Vertex (sup sag sinus)
Posterior fossa (sigmoid sinus) |
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What are the locations where carotid injury most commonly occurs from trauma?
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Points of fixation
|
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Where is temporal bone fracture often first suspected?
|
On head CT to rule out intracranial injury
|
|
What are the findings suspicious for temporal bone fracture on head CT?
|
1) Opacification of mastoid air cells
2) Pneumocephalus 3) Fluid in middle ear 4) Air in the bony labyrinth (rare) |
|
What are temporal bone fractures classified by?
|
Orientation, with respect to the orientation of the petrous portion of temporal bone
|
|
What is the most common type of temporal bone fracture?
|
That which parallels the long axis of the temporal bone, the longitudinal fracture
|
|
What percent?
|
80% of t-bone fractures
|
|
How does it occur?
|
blow to side of head
|
|
Which type of t-bone fx is more severe?
|
Transverse
|
|
What are common sequelae of longitudinal t-bone fx?
|
dislocation of ossicles, with resultant conductive hearing loss
|
|
How does transverse fracture occur?
|
Blow to frontal or occipital region
|
|
What are common sequelae of longitudinal t-bone fxs?
|
Sensorineural hearing loss
Severe vertigo Facial palsy |
|
What percent have facial nerve injury?
|
40%
|
|
What other structure is often injured?
|
Carotid or jugular
|
|
Where do venous epidurals occur?
|
Along dural venous sinus
|
|
Where?
|
Vertex (sup sag sinus)
Posterior fossa (sigmoid sinus) |
|
What are the locations where carotid injury most commonly occurs from trauma?
|
Points of fixation
|