Trauma face radiology
Transcript of Trauma face radiology
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Radiology and facial trauma
2012 Nordter Helsinki
Mats O.Beckman
Traumasection
Diagnostic Radiology
Alas, poor Yorick! (ur Hamlet)
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Eugene Delacroix
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ATLS standards A Airways and Cervical spine control
B Breathing
C Circulation
D Disability ( Neurological symptoms)
E Exposure
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Brå “Assault and severe assault". 50-talet 60-talet 70-talet 80-talet 90-talet 8.000 11.800 20.400 31.400 45.900
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Face fractures incidence
Maxilla - Mandibula 1 : 4.
men 77% - women 23%. Causes:
Battery 40% Traffic 29%
Fall 21%
Sport 4% Work 4%
Others 2% (Lund)
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The Trauma Team
Anesthesiologist
General Surgeon ER Nurse
Radiologist Radiology
Nurse
OR Nurse Assistants
Operation Nurse
Trauma Bay area
Anesthetic nurse
Prehospital Staff
Ortopedic Surgeon
Trauma leader Surgeon
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Radiological methods Xray
• OPG Computed tomography,
• Multislice Ultrasound
Magnetic resonans tomography, MRT
Scintigraphy
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Ortopantomogram, OPG Great overwiew!
Only one projection- fractures can be hidden
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Computed tomography, CT, MSCT More and thinner slices result in higher spatial resolution
Reformations in any plane • sagittal, coronal, oblique
3D and ”volume rendering”
PACS availability
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CT or conventional X-ray?
CT Multitrauma
Comminut fractures
Orbita
Canalis opticus
Ears
Foreign body
3D/4D
X-Ray Isolated Zygoma
Mandibula if OPG
Only stable patient!
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Irradiation risks Lens dose
• Brain CT 50 mGy • Face, C-spine 0,5 mGy
Cancer death
• 5*10-2 Sv-1 Face MSCT 0,6 mSv
• 1 cancer death in 30 000 exams
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Lens ? The adult lens can tolerate a total dose of 5 Gy during a
fractionated course of supervoltage radiation therapy without showing any changes. Doses of 16.5 Gy or higher will almost invariably lead to visual impairment. The dose which causes a 50% probability of visual impairment is approximately 15 Gy.
Int J Radiat Oncol Biol Phys. 1993 Apr 2;25(5):815-20. Links
Radiation dose to the lens and cataract formation. Henk JM, Whitelocke RA, Warrington AP, Bessell EM.
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Lens ? 100 brain CT may start causing cataracts.
300 brain CT will give 50% of the patients cataract.
30 000 face CT will do the same.
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Dose reduction in MSCT Adapt mAs/kV to examined organ
Adaptation to demands • High contrast or low contrast resolution?
As high table speed as possible
Reconstruct as many images as your computer time allows, with overlap
Combination with other examinations to avoid double exposure
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Doses full facial CT Initial examination DLP ca 100-150 mGycm
Postoperative examination DLP 20 mGycm
with noise reduction algorithms
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Normal vs low dose face CT DLP 15 DLP 96
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Axial,sagittal and coronal reformation max 1x1x1mm
Bone Soft
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Anatomical resistances
6=low resistance
1=high resistance 1
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Fractures
Isolated fracture lines
Zygomatic Complex frakturer ”ZMC”
LeFort I, II,III midface fractures
NOE complex
Mandibula
Fractures extending into the neurocranium/ scull base fractures
Orbit fractures
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Fracture Types Zygomatic 40%
LeFort 1 15%
LeFort 2 10%
LeFort 3 10%
Arch 10%
Alveolar 5%
Crush 5%
Accordion fractures
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Pillars, surgically marked
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Regioner- mediala, laterala
”Våningar”- caudala, mellersta, övre
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Zygomatic complex ”Tripod” fracture
• Sutura frontozygomatica, lateral orbit wall • Margo orbitalis inferior • Lateral maxillary sinus wall • Arcus zygomaticus • Orbital floor ?? Association to blow-out fracture.
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Elephant lines
Dolans lines
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Classic Zygomatic fracture
OBS! Orbital floor???
Direction of dislocation
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Zygomaticus 4D
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Zygomatic axial
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René Le Fort (1869 – 1951) was a French army surgeon from Lille Etude expérimental sur les fractures de la machoire supérieure 1901
Published book on mediastinum war trauma 1918, accomplished front line war surgeon!!
http://www.sciencedirect.com/science/article/pii/S0266435609005397
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Le Fort
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LeFort-fractures
I Alveolar process and hard palate
II Maxilla
III Maxilla and both zygomatic
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Mandibula Anatomy
• corpus, angulus, ramus, processus coronoideus (muscularis), collum, caput, alveolar process.
• Foramen mentale
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Mandibula
Directions: • Mesial, distal • lingual, buccal
Mesial
Distal
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Muscles add traction to fragments . Closers:: 1. m. Temporalis
2. m. masseter
3. m. pterygoideus medialis
• Openers: 4. m. geniohyoideus
5. m. digastricus
• Translation: 6. m. pterygoideus lateralis
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Mandibula fractures
Collum 36%
Ramus 4%
Angulus 20%
Corpus 40%
Alveolar, muscular process, caput, teeth…
40% 20%
4%
36%
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Type fractures mandibula Corpus, angulus
Collum
Intracapsular caput fractures
Combination of corpus and contralateral collumfracture
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Mandibula
Same patients , fractures Window!!!
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Comminute fracture Lefort +Zygomatic
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Blowout Op if > 1 cubic cm fat herniated.
OBS muscular entrapment • rectus inferior • rectus medialis/ obliqus sup if
medial lamina papyracea fracture
• Relationship to optic canal??? • Orbital hematoma?? Intraconal?
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Entrapment. A surgical emergency!
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Entrapment – Trapdoor fracture
Entrapment of m rectus inferior : children, ”green-stick” fracture
Vasovagala symptoms – occulocardial reflex
Surgical emergency (< 24 timmar)
• Trapdoor fracture of the orbit in a pediatric population - Grant 2002 • Underestimation of soft tissue entrapment by computed tomography in
orbital floor fractures in the pediatric population – Parbhu 2008
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Bulb Oil treatment ! For retinal detachment
The welding equipment blew up..
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Fuzzy sight?
Loss of red?
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Trauma Dx. Bulb deformation Retrobulbar heamtoma
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Eye foreign body MVC; glas in the eye
lead
air
Bulbform
Other damage?
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Optic canal
Comminute fractures increase risk for optic damage
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Lacrimal canal
Fractures may cause tear flow problems
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Associated damages Airway
Bleeding
Intracranial bleedings
C-spine fractures
Bulb, optic nerve
Neck arteries
Hyoid Larynx
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Hyoid Hyoid fracture
Bicycle accident
Associated neck fractures and Le Fort face fractures
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Hyoid fracture Strangulation
Rare in other trauma
Associated with airway compromise, seen in forensics……
Am Surg. 1999 Sep;65(9):877-80
http://www.ncbi.nlm.nih.gov/pubmed/10484094
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Neck vessels
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Contusions High energy trauma!
Risk for IC bleeding > 1% in face fracture and no IC symtoms
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Puck
Hockey fan; Early 3D
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Comminute facial trauma Make a complete exam at first show
Face trauma team includes
ENT, reconstructive surgeons, Neuro, Jaw surgeons, Radiology
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Comminute fracture 2 Le Fort 1 och 3
NOE complex
Frontal sinus
Caput mand dx
Orbita floor sin
Cerebral contusions
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Comminute fracture 3 Missing tooth Fr canalis opticus
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Optic canal
Comminute fractures increase risk for optic damage
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Frontal sinus Posterior wall of frontal sinus??
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Postoperative evaluation Implants well visible, no artifacts
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3D in real time
Teeth
Teeth bone algorithm
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Tooth infection
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Combinations of injuries US 2002-2006 2.7 million reported traumas.
Mulligan JTrauma 2010
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The incidence of facial fracture was 3.5% in patients with a c-spine injury, 21.7% in patients with a head injury, and 24.0% of patients with a combined c-spine and head trauma. Head injuries were found in 40.2% of patients with a c-spine injury, 67.9% of patients with a facial fracture, and 71.5% of patients with a combined c-spine injury and facial fracture. C-spine injuries were reported in 6.7% of facial fractures, 7.0% of head injuries, and 7.8% of patients with a combined facial fracture and head injury.
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The incidence of facial fracture was 3.5% in patients with a c-spine injury, 21.7% in patients with a head injury, and 24.0% of patients with a combined c-spine and head trauma. Head injuries were found in 40.2% of patients with a c-spine injury, 67.9% of patients with a facial fracture, and 71.5% of patients with a combined c-spine injury and facial fracture. C-spine injuries were reported in 6.7% of facial fractures, 7.0% of head injuries, and 7.8% of patients with a combined facial fracture and head injury.
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Computed tomography Nobel Price 1979 in medicine
Allan M. Cormack USA
Sir Godfrey Hounsfield
England