MDCT of Mediastinal Injury MDCT of Mediastinal Injury MDCT of Mediastinal Injury Stuart E. Mirvis, MD, FACR Department of Radiology & Maryland Shock-Trauma Center University of Maryland School of Medicine 5 th th Nordic Trauma Nordic Trauma Radiology Course Radiology Course Vascular Injury in Vascular Injury in Mediastinal Mediastinal Trauma Trauma
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CT-A in Trauma
Stuart E. Mirvis, MD, FACR
MDCT of Mediastinal InjuryMDCT of Mediastinal InjuryMDCT of Mediastinal Injury
Stuart E. Mirvis, MD, FACR
Department of Radiology & Maryland Shock-Trauma Center
Vascular Injury in Vascular Injury in MediastinalMediastinalTraumaTrauma
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Major Aortic BranchesMajor Aortic Branches
Dissection / thrombus: Dissection / thrombus: left common carotidleft common carotid
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Branch vessel injuriesBranch vessel injuries
Right Right subclaviansubclavian artery avulsionartery avulsion
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Innominate Artery PsAn
Aortic InjuryAortic Injury
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
What has been established #1
Essentially all aortic injuries are accompanied by mediastinal hematoma (abnormal chest radiograph) but this may be very minimal.
Helical CT, and particularly MDCT, are adequate to diagnose or exclude the vast majority of aortic injuries.
What has been established #2
Negative CT no angiography or CT follow-up.A positive CT no aortogram to confirm.Use of MDCT screening for blunt chest trauma reliably establishes or excludes aortic injuryA rare equivocal CT requires catheter angiography and TEE may be helpful.
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Aortic stents: favorable anatomy, not good operative risk
Temporary non-operative management: severe concurrent injury
BE CAREFUL: Atypical LocationsBE CAREFUL: Atypical Locations
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Atypical location
Bleeding Ascending Aortic
PsAn
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Ascending Aorta Pseudoaneurysms
Atypical Location: Arch and LCC
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Atypical Location:
ARCH
Aortic Arch
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Proximal branches
Multifocal intimal flaps
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
BE CAREFUL: BE CAREFUL: CongentialCongential AnomaliesAnomalies
Ductus diverticulum
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Ductus diverticulum
Smooth wallObtuse margins with aortaNo intimal flapsNo mediastinal hemorrhageNo retained contrast on “wash out”
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Aberrant Rt. SCA and intimal tear
Left SVC
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Right aortic arch; aberrant and atrophic left
subclavian artery
Diverticulum of Kommeral (D): Aortic arch pseudoaneurysm
D
D
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
CHALLENGING CASES
USE THE TECHNOLOGY !!
Atypical pseudoaneurysm:
calcified ductus remnant
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Aortic InjuryAortic Injury
Subtle aortic injury (minimal mediastinal blood)
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Ductus remnant:
Aortic spindle
Aortic Injury with minimal mediastinal hemorrhage
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Subtle injury & minimal
periaortic blood
Intimal tear, but no mediastinal blood
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Aortic Injury ?
YES, BUT NO MEDIASTINAL BLOOD
Aortic Injury or Ductus?
DUCTUS
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Intimal tear: No mediastinal blood: Resolved 2 days later
2 days later
Distraction T-spineIntimal flap
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Aortic injury?
Probably not, old injury?, aortic
spindle
3-floor fall: Aortic Injury ???
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Outcome
Patient had positive transesophageal sonographyAorta opened at surgery – NO injury1-month hospitalization from complications of thoracotomy
0.4 - 1.5% after blunt traumaVery high pre-hospital mortality (70-80%)Thoracic trachea > cervical tracheaRight mainstem > Left mainstemTypically within 2.5 cm of carinaDiagnosis not established acutely in 70%
– Compression of closed glottis– Crush (spine & sternum)– Traction across carina with compression– Shearing during deceleration– Tranverse force*: cables, tree limb,
clothes-line, rope
–* produces tear with 3 kg force versus 11 kg force for
longitudinal force
Radiologic FindingsRadiologic FindingsProgressive, extensive air leak despite chest tubePneumothorax despite chest tubeEndotracheal balloon overdistensionEctopic endotracheal tube or balloonFallen lung signDeformity of mainstem bronchusAir outline of mainstem bronchi
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Diffuse air leak as Diffuse air leak as an indirect sign of an indirect sign of
airway injuryairway injury
Fallen Lung with Tension
Pneumothorax
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
TracheoTracheo--bronchial Injurybronchial Injury
Tracheobronchial InjuryTracheobronchial Injury
Trans-tracheal GSW
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Tracheobronchial Tracheobronchial InjuryInjury
Progressive, persistent air leak
Fallen lung
Ectopic ET tube
Abnormally shaped balloon
Direct air leak – CT
Deformed mainstem bronchi
Peritracheal Air Sign:
Double Wall Mainstem
Bronchi
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Direct Air LeakDirect Air Leak
Tracheal Rupture: ETT Balloon Sign
Tracheal Rupture: ETT Balloon Sign
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Right mainstem bronchus rupture
GSW Trachea
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
More proximal tracheal injury less common to have pneumothoraxInflation of endotracheal balloon does NOT rupture airway (75 ml)Accuracy of spiral CT alone 71%*
*Chen JD, Shanmuganathan K, Mirvis SE, et al. AJR 2001
Tracheobronchial Injury
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
Esophageal TraumaEsophageal Trauma
Trauma accounts for Trauma accounts for < 10% injuries< 10% injuriesIatrogenic most Iatrogenic most commoncommonBlunt 96 cases Blunt 96 cases reported 1900 reported 1900 -- 19881988Variable Variable mechanisms:mechanisms:
Esophageal TraumaEsophageal Trauma Lacks specific symptoms, often lateRadiography: Non-specific (widened mediastinum, mediastinal air near tear, left pleural fluid)CT: same findings, but may perform after esophagram to increase sensitivityEsophagram -endoscopy
CT-A in Trauma
Stuart E. Mirvis, MD, FACR
EsophagealEsophagealDisruptionDisruption
Consider with any potential penetrating mediastinal traumaCT helps define missile tract to assess likelihood of injuryGas from esophagus (not under pressure) stays near esophagusCan spiral CT with contrast swallow establish diagnosis directly? Consider tracheal and vascular injury