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Flashcards in Neuro trauma Deck (23)
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1

Location of diffuse axonal injury bleeds in order ?

1. Subcortical white matter
2. Posterior limb internal capsule
3. Corpus callosum
4. Dorsolateral midbrain

2

Common causes of subarachnoid hemorrhage

1. Traumatic
2. Aneurysm rupture
AVM, perimesencephalic venous hemmorhage, ruptured dissecting aneurysm, hypertensive hemmorhage, cerebral infarction with reperfusion hemmorhage, anticoagulation therapy, blood dyscrasia, eclampsia, spinal vascular malformation

3

Segments of the carotid

1 - Cervical Segment
2 - Petrous
3 - Lacerum
4 - Cavernous
5 - Clinoid
6 - Ophthalmic (supraclinoid)
7 - Communicating (terminal)

4

Segments of Vertebral Artery

V1 - origin to transverse foramen of C6
V2 - transverse foreman of C6 to transverse foreman of C2
V3 - C2 to dura
V4 - Dura to confluence of basilar artery

5

Risk factors for dissection

Fibroelastic thickening
Fibromuscular hyperplasia
Cystic medial degeneration
Marfan Syndrome
Ehlers-Danlos
Homocystinuria
Loeys-Dietz Syndrome
Syphilis

6

Most common location for intracranial dissection

Supraclinoid carotid

7

What are the types of occipital condyle fractures and which is unstable?

1 - impaction injury with no displacement - stable
2 - skull base fracture extending through occipital condyle - stable
3 - avulsion fracture - unstable due to tension on alar ligament

8

What is a Jefferson Fracture?

Burst fracture through C1 fracuture bilateral posterior arch or single unilateral anterior arch.
Results in outward displacement of lateral masses.

9

What are finding of posterior ligamentous complex instability on CT?

Inferred on CT by:
Splaying of spinous processes
avulsion fracture of superior or inferior aspects of contiguous spinous processes
Widening of facet joints
Empty/Naked facet joints
perched or dislocated facet joints
vertebral body translation or rotation

10

What is the classification of Odontoid fractures and their stability?

Type I - tip of dens. uncommon. Fuse well with immobilization. Stable.
Type II - Fracture at the Dens-body junction. Most common. Risks for instability - Age >50, >6mm displacement, comminution or splinter fragments.
Type III - Fracture line extends through cancellous portion of C2 body. Potentially unstable. Heal with immobilization usually.

11

What is a hangman fracture and mechanism?

Bilateral traumatic pars interarticularis fracture resulting in spondylolysis.
Mechanism either compressive hyperextension or distractive flexion.

12

Classification of Hangman #'s

Type 1 - 11 degrees, >2mm translocation. variable stability
Type 2a - severe angulation without translocation. intact anterior longitudinal ligament.
Type 3 - bilateral facet dislocation - UNSTABLE

13

What is atlanto-axial subluxation?

Anterior facet of C1 fixed on facet of C2 causing impaired rotation.

14

Types of blunt cervical vascular injuries

Minimal intimal injury
Raised intimal flap
Dissection with intramural hematoma
Occlusion
Pseudoaneurysm
Transection with active hemorrhage
Arteriovenous fistula

15

What is a chance fracture

Vertebral fracture through all 3 columns. Most common at thoracolumbar junction. Mechanism commonly flexion and distraction.

16

What are the buttresses of the face? 3 horizontal and 3 vertical

Horizontal - Superior orbital rim, inferior orbital rim, alveolar ridge
Vertical - nasomaxillary, zygomaticomaxillary, pterygomaxillary

17

Naso-orbital ethmoid fracture includes

Intersection of multiple bones - maxillary, lacrimal, nasal, and frontal. Fractures include the inferior orbital rim, medial orbital rim, nasal bones and ethmoid.

18

What are the 4 components of a quadripod fracture of the zygomaticomaxillary complex?

zygomaticofrontal, zygomaticomaxillary, zygomaticotemporal, and zygomaticosphenoid

19

Definition of LeFort Fractures

All must involve the pterygoid plates. And disrupt the pterygomaxillary buttress
I - horizontal plane detaches hard palate/ all walls of maxillary sinus
II - pyramidal spares medial walls of maxillary sinus. Fracture through medial and inferior orbital rims and zygomaticomaxillary buttress. Dissociate mid face from skull
III - Complete midface dissociation. Fracture through the zygomatic arch

20

What is injured in a cervical hyperextension-rotation injury

Below C2. Usually C6/7
Asymmetric injury of the posterior column
Can present with radiculopathy

21

What is injured in a cervical hyperflexion injury?

Fracture of neural arch and widening of anterior portion of disc space
mid-lower c-spine

22

What is the difference injuries in cervical hyper flexion injury with compression vs distraction

Compression - forced flexion with axial loaded spine, primary injury to anterior and middle columns
Distraction/Shearing - failure posterior then middle columns

23

What is the differential for Odontoid fracture?

Os Odontoideum - odontoid replaced by ossicle with no continuity to C2 body
Pathologic C2 Fracture
Rheumatoid - C1/C2 subluxation
Ossiculum Terminale Persistens - confusion of ossiculum terminal to body of dens beyond 12th year of age
Congenital variation - 3rd occipital condyle, bony peg of anterior lip of foramen magnum(simulate type 1 fracture)