Subdural Hematoma vs Epidural Hematoma
Subdural Hematoma vs Epidural Hematoma
Subdural and epidural hematomas are traumatic intracranial hemorrhages with different sources, imaging appearances, and clinical courses. Epidural hematomas arise from arterial bleeding (usually middle meningeal artery) and have a classic "lucid interval," while subdural hematomas arise from bridging vein rupture and are more common in the elderly.
Comparison Table
Key Differences
- →Subdural = venous (bridging veins), crescent shape, crosses sutures
- →Epidural = arterial (middle meningeal), lens shape, limited by sutures
- →Epidural has "lucid interval" then rapid decline; subdural is more gradual
- →Epidural is surgical emergency; subdural treatment varies by acuity
Clinical Relevance
- •Epidural hematoma: "Talk and die" syndrome - patient may seem fine initially then deteriorate rapidly
- •Chronic subdural: Can present with confusion, personality changes, focal deficits weeks after minor trauma
- •CT scan is the diagnostic study of choice for both
- •Both can cause herniation and death if untreated
Study Tips
- ✓Epidural = "Egg-shaped" or lens-shaped, limited by sutures where dura is attached
- ✓Subdural = "Sickle-shaped" crescent, can spread across the hemisphere
- ✓Epidural is an Emergency with rapid deterioration (arterial bleeding)
- ✓Think of elderly patients with chronic subdural from trivial trauma
FAQs
Common questions about this comparison
The lucid interval occurs because initially, there's no direct brain injury. Arterial bleeding accumulates, stripping the dura from the skull. As the hematoma expands, intracranial pressure rises, eventually causing brain compression, herniation, and rapid neurological decline. The interval can last hours.
Elderly patients have brain atrophy, which stretches the bridging veins as the brain shrinks away from the skull. These stretched veins are more easily torn by even minor trauma. Additionally, many elderly patients take anticoagulants, and alcoholics have cerebral atrophy and coagulopathy.