What is the test of choice for epidural hematoma, and what does it show?

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What is the test of choice for epidural hematoma, and what does it show?

The key concept is that acute epidural hematoma is best detected quickly with a non-contrast CT scan of the head, and it has a distinctive appearance: a convex, lens-shaped (biconvex) hyperdense collection between the skull and the dura that does not cross suture lines. This shape reflects the buildup of blood between the dura and skull, usually from a middle meningeal artery injury often linked to a temporal bone fracture. Because the bleed is arterial and can expand rapidly, a non-contrast CT is the fastest and most reliable test to diagnose it and guide urgent surgical planning for evacuation. Contrast-enhanced CT is not preferred in this acute setting, as contrast can obscure the blood and isn’t needed to identify the characteristic hematoma. A subdural hematoma, by comparison, tends to be crescent-shaped and can cross sutures, which is why that pattern isn’t consistent with epidural bleed. MRI is more sensitive for non-acute injuries but isn’t the first choice in an acute emergency, and plain X-ray can miss an epidural hematoma entirely.

The key concept is that acute epidural hematoma is best detected quickly with a non-contrast CT scan of the head, and it has a distinctive appearance: a convex, lens-shaped (biconvex) hyperdense collection between the skull and the dura that does not cross suture lines. This shape reflects the buildup of blood between the dura and skull, usually from a middle meningeal artery injury often linked to a temporal bone fracture. Because the bleed is arterial and can expand rapidly, a non-contrast CT is the fastest and most reliable test to diagnose it and guide urgent surgical planning for evacuation.

Contrast-enhanced CT is not preferred in this acute setting, as contrast can obscure the blood and isn’t needed to identify the characteristic hematoma. A subdural hematoma, by comparison, tends to be crescent-shaped and can cross sutures, which is why that pattern isn’t consistent with epidural bleed. MRI is more sensitive for non-acute injuries but isn’t the first choice in an acute emergency, and plain X-ray can miss an epidural hematoma entirely.

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