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Imaging Of Facial Trauma Part 1
1. Imaging of Facial Trauma
Part 1: Introduction and Anatomy
Rathachai Kaewlai, MD
www.RadiologyInThai.com
Created: January 2007
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οquot;
2. Outline
οβ Facial fracture epidemiology οβ Types of facial fracture
οβ Nasal bone fracture
οβ Initial management οβ Naso-orbital-ethmoid fracture
οβ Frontal sinus fracture
οβ Imaging: CT versus radiography οβ Orbital fracture
οβ Zygomatic fracture
οβ Normal anatomy
οβ Maxillary fracture
οβ 3D οβ Mandibular fracture
οβ CT (axial, coronal and sagittal planes)
οβ Radiography οβ Imaging approach
οβ Biomechanics
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3. Epidemiology
οβ Etiology (USA)
οβ Motor vehicle collision (MVC) most common cause
οβ Followed by fights, assaults
οβ Less common: fall, sports activities, industrial accidents, gun shot wounds
οβ Soft tissue injury is more common than fracture
οβ Co-existence of other injury
οβ 3-14% of patients with facial fracture have skull fractures
οβ 1-4% of patients with facial fracture have cervical spine fractures
οβ 20% of patients with cervical spine fractures have facial injury (half soft tissue
injuries, half fractures)
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4. Epidemiology
οβ Distribution of fracture
οβ Vary with mechanism of injury
οβ In general, most common facial fracture is nasal bone fracture
οβ Most common fracture in admitted patients is zygomatic
complex (ZMC) fracture at 40%, followed by complex fractures
such as LeFort fracture
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5. Epidemiology
οβ Facial fracture in children
οβ Less common (< 10% of all facial fractures occur in children)
οβ Less severe than adults
οβ Most common etiology is fall
οβ Reasons: midface is less prominent, sinuses are less
pneumatized, more elasticity of bones
οβ Fractures that are more frequent in children than in adults
οβ Mandibular condyle
οβ Orbital roof
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6. ABC of Trauma
οβ Initial patient management is to secure airway (A), breathing (B) and
circulation (C)
οβ Evaluation of more serious injuries of the head, chest and abdomen
οβ Avoid blind insertion of endotracheal tube and nasogastric tube
οβ Significance of facial trauma for the initial management
οβ Facial fractures may impinge on oral or nasal airway
οβ Nasal bleeding may be life threatening
οβ Mandible fractures may cause loss of support for tongue, then airway
compromise
οβ Facial fractures may compromise vision
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7. When to Do
Imaging of the Face?
οβ When the patient is stabilized
οβ Clinically (Airway, Breathing, Circulation - stable),
οβ Initial goal is to preserve life - then later restore the form and
function of the face
οβ Cervical spine clearance
οβ Radiographically
οβ For cervical spine clearance
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8. When to Do
Imaging of the Face?
οβ Head CT should be thoroughly evaluated in a multi-trauma
patients
οβ Search for critical, emergent finding: some facial injuries may
compromise vision if not immediately recognized
οβ In stable patient, face CT can be performed with little
additional time when the patient is already in the scanner
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9. What Imaging to Do?
οβ Role of imaging
οβ Identify fractures, fragment displacement and rotation, stable bone
for use in surgical repair
οβ Identify soft tissue injuries
οβ CT is the imaging modality of choice because
οβ High accuracy for evaluation of both bony and soft tissue injuries
οβ Can be cost-saving screening exam when compared to multiple
views of plain film radiography*
οβ Radiation dose is far below the threshold for cataract formation
*Turner BG et al. AJR Am J Roentgenol 2004;183:751-754
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10. Normal Anatomy
οβ Face
οβ Face (midface) is the region
from supraorbital rims to
and including maxillary
FACE
alveolar process
οβ Mandible, including the
temporomandibular joints
(TMJ), considered separate
from the face
οβ This lecture series will
include both parts (face and
mandible)
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11. 3D CT
Anterior View
Major structures
are labeled in the
picture.
ο Nasofrontal suture
οο Zygomatico-
frontal suture
οοο Zygomatico-
temporal suture
SOF = Superior orbital
fissure
IOF = Inferior orbital
fissure
Orbital βrimβ is different
from the βwallβ
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12. 3D CT
Left Lateral View
οο
ο Nasofrontal suture
οο Zygomatico-frontal suture
οοο Zygomatico-temporal suture
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14. Computed Tomography (CT)
οβ Preferred modality for imaging of the face
οβ More sensitive for fracture detection
οβ Show significant soft tissue injury, especially the globe
οβ Easier to perform, quicker than complete views of plain film
radiographs
οβ Pre-surgical planning for complex injuries
οβ Disadvantage of CT
οβ CT can miss subtle tooth fracture along the axial plane,
additional orthopanthogram may be helpful to detect tooth
fracture
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15. Computed Tomography (CT)
οβ CT protocol
οβ Axial scanning from above the frontal sinus down to below
hard palate (face), and can be scanned further to include the
mandible, if there is a clinical suspicion for fracture of
mandible
οβ For helical (spiral) scanner, axial images can be reconstructed
to coronal and sagittal planes without the need for direct
coronal scanning
οβ Viewing in both bone and soft tissue windows, in 3 planes
(axial, coronal and sagittal)
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16. β’βPosterior wall of
frontal sinus fracture
may co-exist with brain
injury
β’βPresence of
pneumocephalus
signifies dural tear
related with the fracture
β’βInferior part of frontal
sinus constitute the
medial orbital wall
Key structures
A = Frontal sinus, anterior wall
B = Frontal sinus, posterior wall
*Note: The right frontal sinus is not pneumatized in this case.
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17. ο
Key structures
D = Orbit, medial wall
E = Orbit, lateral wall
F = Suture between
sphenoid and zygomatic
bones
= Nasomaxillary
suture
1 = Globe
2 = Ethmoid sinus
3 = Sphenoid sinus
4 = Nasal bone
5 = Maxilla, frontal
process
β’βDo not misinterpret the suture between nasal bone and frontal process of 6 = Orbit, lateral rim
maxilla for a fracture 7 = Sphenoid bone
β’βLook for a piece of fracture in the optic foramen, it is the true emergency of 8 = Optic foramen
facial fracture
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18. Key structures
F = Groove for
infraorbital nerve
G = Maxillary sinus,
posterolateral wall
5 = Maxilla, frontal
process
9 = Maxillary sinus
10 = Zygomatic arch
11 = Pterygoid bone
12 = Nasolacrimal duct
13 = Mandible, condyle
Clear maxillary sinuses
can almost rules out
certain fractures such as
ZMC, LeFort, blowout
fractures
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19. Key structures
H = Maxillary sinus,
anterior wall
I = Maxillary sinus,
medial wall
J = Medial pterygoid
plate
K = Lateral pterygoid
plate
9 = Maxillary sinus
14 = Mandible, ramus
Fracture of the
pterygoid plates may
represent LeFort
fracture
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20. Key structures
J = Medial pterygoid
plate
K = Lateral pterygoid
plate
L = Maxilla, spine
14 = Mandible, ramus
15 = Maxilla bone/ hard
palate
Lucency in midline of
the maxilla is a normal
finding seen
occasionally
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21. Coronal
Reformatted Image
Key structures
L = Maxilla, spine
= Nasomaxillary suture
4 = Nasal bone
5 = Maxilla, frontal process
β’βDo not confuse nasomaxillary suture for a fracture
β’βRemind yourself that CT can miss subtle tooth fracture,
although with the coronal and sagittal reformation. Obtain
orthopanthogram or dedicated tooth film when in doubt
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22. Key structures
D = Orbit, medial wall
M = Nasal septum
5 = Maxilla, frontal process
15 = Maxilla bone/ hard palate
16 = Frontal sinus
17 = Mandible, body
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23. Key structures
M = Nasal septum
N = Ethmoid bone,
perpendicular plate
O = Orbit, roof
P = Orbit, floor
Q = Maxillary sinus,
posterolateral wall
οο = Zygomatico-frontal
suture
1 = Globe
2 = Ethmoid sinus
6 = Orbit, lateral rim
9 = Maxillary sinus
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25. Sagittal Reformatted Image
Key structures
R = Temporomandibular joint (TMJ)
13 = Mandible, condyle
14 = Mandible, ramus
19 = Mandible, coronoid process
20 = Mastoid air cells
If patient opens his/her mouth during the
scan, there is a normal anterior gliding of
the mandibular condyle relative to the
glenoid fossa. That can look like
subluxation of the TMJ
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26. Key structures
P = Orbit, floor
7 = Pterygoid bone
9 = Maxillary sinus
15 = Maxilla bone /hard
palate
β’βOrbital blowout fracture is
best seen in sagittal and
coronal images
β’βFacial CT is not
completed without image
(2D) reformations
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27. Key structures
3 = Sphenoid sinus
4 = Nasal bone
15 = Maxilla bone/
hard palate
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29. Axial Coronal
Sagittal
Right Orbit, soft tissue window
Key structures:
ON = Optic nerve MR = Medial rectus
LR = Lateral rectus IOL = Intra-ocular lens
β’βGlobe contour should be smooth
β’βClean (dark) retro-bulbar fat
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30. οβ The information provided in this presentationβ¦
οβ Is intended to be used as educational purposes only.
οβ Is designed to assist emergency practitioners in providing
appropriate radiologic care for patients.
οβ Is flexible and not intended, nor should they be used to
establish a legal standard of care.
οβ Thanks, MGH Radiology, for cases Iβve seen and things Iβve
learned.
R.K.
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