Epidural AKA Extradural Hemorrhage Case

Define the pterion

H shaped area that lies deep to the temporal muscle. Meeting point of 4 bones: frontal, parietal, temporal, and greater wing of sphenoid.

What part of the temporal fossa is the pterion located

The ant part. 4cm sup to zygomatic arch and post to frontozygomatic suture.

Why is the pterion clinically important

It indicates the location of the frontal branch of the middle meningeal artery.

Where does an extradural haematoma occur

Between the inner table of the skull and periosteal layer of dura mater

Where does a subdural haematoma occur

Between the dura mater and arachnoid mater

What vessels are typically involved in an extradural haematoma

Middle meningeal artery

What vessels are typically involved in a subdural haematoma

Bridging veins between cortex and dural sinuses

What is cerebral herniation

Displacement of brain tissue due to increased intracranial pressure

What is the tentorial notch

An opening in the tentorium cerebelli through which the midbrain passes.

How can hernation at the tentorial notch affect the brainstem

Compresses and displaces the midbrain.

Why is the midbrain important in CSF flow

It contains the cerebral aqueduct connecting the 3rd and 4th ventricles.

How does cerebral herniation cause hydrocephalus

Compression of the cerebral aqueduct obstructs CSF flow. Resulting in obstructive hydrocephalus.

Which ventricles dilate in aqueduct obstruction

Lateral and third ventricles

What is the primary effect of an extradural haematoma on the brain

Rapid increase in intracranial pressure due to arterial bleeding

What is a classic clinical feature of extradural haematoma

Brief loss of consiousness, a lucid interval, followed by rapid deterioration.

What severe complication can result from an untreated extradural haematoma

Cerebral herniation.