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Epidural Hematoma
Etiology: traumatic coup injury, tearing of middle meningeal artery / diploic veins / dural sinus results in blood between inner skull and outer dura
Imaging: biconvex shape, doesn’t cross suture, crosses tentorium + falx, skull fracture in only 40% due to plinacy of skull
Note: can occur infratentorial as well as supratentorial
Clinical: lucid interval
Cases of Epidural Hematoma
Axial CT without contrast of the brain shows a high density fluid collection in the left frontal subcutaneous tissue. There is also an underlying lentiform mixed density intracranial fluid collection.Axial CT without contrast of the brain shows a right frontal high density biconvex intracranial extra-axial fluid collection.Axial CT without contrast of the brain shows a mixed density biconvex intracranial extra-axial fluid collection posterior to the left cerebellum.