cranial trauma - mbbsclub.com medicine/cranial trauma.pdf · sub acute epidural hemorrhage •...
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CRANIAL TRAUMA
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INTRACRANIAL HEMORRHAGE
• Epidural/extradural hemorrhage • Subdural hemorrhage • Subarachnoid hemorrhage • Intra cerebral hemorrhage
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EPIDURAL HEMORRHAGE
• Acute • Sub acute
– Bleeding between Dura and skull – Always traumatic – Usual site is Parietotemporal area
• Never a contrecoup injury
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ACUTE EPIDURAL HEMATOMA
• Rupture of middle meningeal artery
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SUB ACUTE EPIDURAL HEMORRHAGE
• Dural sinus ,middle meningeal veins,diploic veins • Slow onset • Lucid interval • Rapid resolution
– No expansion of clot
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MEDICOLEGAL IMPORTANCE
• Prognosis is good with treatment • Lucid interval (negligence)
• Resemble drunkenness • Heat hematoma
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SUBDURAL HEMATOMA
– Cortical vessels/Dural sinuses – Bridging or communicating veins
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• Acute – Signs evident within 24 hours
• Sub acute – 24 hours -7 days
• Chronic – Develop after 7 days
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ACUTE SUBDURAL HEMATOMA
• Cortical artery /large bridging veins
– Mobile
• Poor prognosis
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SUB ACUTE SUBDURAL HEMATOMA
• Small bridging veins
Sudden death in alcoholics
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CHRONIC SUBDURAL HEMATOMA
• Slowly develop • Encased in membranes • Re bleeding through vascular channels
• Recent lesions • Old hematoma
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GROSS APPEARANCE
• Within few hours
• 10-12 days
• 2nd week
• More than 3 weeks
• After one month
• Cellular infiltration
• Dark red to brownish color
• Discrete surface membrane
• Liquefaction of contents • Firm capsule –cystic cavity
(dark brown watery fluid )
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DATING OF SUBDURAL HEMATOMA
• Capillary dilatation • Proliferation of fibroblast • Thin layer of fibrin
– (fibroblastic and capillary proliferation
• Red cell decomposition – Pseudo membrane
• True inner membrane • appearance Connective
tissue of mature • Mature connective tissue
• 1st 24 hours • 2-3 days • 4-5 days
• 5-10 days
• 2-4 weeks • After 4 weeks • 1-3 months
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SUBARACHNOID HEMORRHAGE
• Natural causes/trauma • Laceration of vital arteries
• Internal carotid artery ,vertebral, basilar
• Natural causes
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• Traumatic causes – Contusion/laceration – Explosive blast – Asphyxia – Fracture of cervical vertebra – Hyperextension of head during bronchoscopy
– Residual yellow brown staining of Pia /Arachnoid • Hemolysis turns CSF into xanthochromatic yellow
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MEDICOLEGAL ASPECTS
• Ruptured berry aneurysm and trauma • Subarachnoid hemorrhage and alcohol
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Vertebral column and spinal cord
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• Vulnerable areas
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• Fracture of the spine
• Difficult to detect • X-ray should be taken before autopsy
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Spinal cord injuries
• Concussion • Compression • Pithing • Laceration
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Concussion
• Without external evidence of injury – Common form of injury in railway accidents and
motor car collision – Railway spine
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• Hyperextension is much more dangerous in causing spinal damage
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• Momentary dislocation of c4-c6 • Contusion of spinal cord followed by self reduction • At autopsy
– Area of hemorrhagic discoloration on the surface or in the substance of the cord ,or subthecal effusion of the blood
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• Blow on the spine – Edema – Venous thrombosis – Softening of cord
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Compression of spinal cord
• Fracture /dislocation of spine – C4-c6 – T3-T6 – T10-L3
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• Pithing – Process of killing by small needle between
• base of skull and first cervical vertebra • 2nd and 3rd cervical vertebra
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• Laceration – Without external injury especially in children – Twisting and dislocation – Firearms