Extradural Haematoma Flashcards
What is an extradural haematoma?
Accumulation of blood between dura and bone
Usual cause of extradural haematoma?
Separation of dura and bone following a shearing stress
Most common source of bleeding in an extradural haematoma?
Middle meningeal artery from a temporoparietal fracture because this runs under the thinnest part of the skull called the pterion
Thinnest part of skull is called?
Pterion
Who and when does extradural haematoma typically present?
In young adult
After head trauma
Classic presentation of extradural haematoma?
Brief loss of consciousness
Followed by lucid interval after that the patient further deteriorates
- Headache
- Vomiting
- Contralateral hemiparesis
- Ipsilateral pupillary dilation
Why does ipsilateral pupillary dilation occur?
Due to temporal lobe herniating and compressing the oculomotor nerve
Imaging of choice for extradural haematoma?
Unenhanced CT
Appearance of extradural haematoma on imaging?
Lens shaped appearance
because it is bounded by fissures as the haemorrhage is above the dura
What colour does blood appear as in imaging for extradural and what is that imaging form again?
Blood appears as white (because acute)
-Unenhanced CT
