Differentiate epidural hematoma from subdural hematoma on the basis of shape, source, and typical patient presentation.

Differentiate epidural hematoma from subdural hematoma on the basis of shape, source, and typical patient presentation.

• A. Epidural hematoma is crescent-shaped from bridging veins; subdural is lens-shaped from middle meningeal artery.
• B. Epidural hematoma is focal contusion; subdural is diffuse.
• C. Epidural hematoma is biconvex/lens-shaped, from middle meningeal artery injury; subdural hematoma is crescent-shaped, from bridging veins and often slower in onset and in older with brain atrophy.
• D. Epidural hematoma is venous bleed; subdural is arterial bleed.

Answer: (C)

Distinguishing these two hemorrhages hinges on shape on imaging, the vessel involved, and how the presentation tends to unfold. Epidural hematomas classically appear as a lens-shaped (biconvex) collection that sits between the skull and the dura. This shape comes from arterial bleeding, most often the middle meningeal artery, usually after a temporal bone fracture. Because arteries bleed rapidly, patients may have a brief loss of consciousness, a lucid interval, and then rapid neurological deterioration. Subdural hematomas, by contrast, are crescent-shaped, following the contour of the brain, and occur from tearing of bridging veins. They are typically venous, and the onset can be slower, with symptoms evolving over hours to days. They are more common in older individuals with brain atrophy or after minor head trauma. So the correct answer aligns with a biconvex/lens-shaped hematoma from middle meningeal artery injury for epidural, and a crescent-shaped hematoma from bridging veins with slower onset and more common in older patients for subdural. The other descriptions mix up shapes or vessel sources or oversimplify the presentation.

Distinguishing these two hemorrhages hinges on shape on imaging, the vessel involved, and how the presentation tends to unfold.

Epidural hematomas classically appear as a lens-shaped (biconvex) collection that sits between the skull and the dura. This shape comes from arterial bleeding, most often the middle meningeal artery, usually after a temporal bone fracture. Because arteries bleed rapidly, patients may have a brief loss of consciousness, a lucid interval, and then rapid neurological deterioration.

Subdural hematomas, by contrast, are crescent-shaped, following the contour of the brain, and occur from tearing of bridging veins. They are typically venous, and the onset can be slower, with symptoms evolving over hours to days. They are more common in older individuals with brain atrophy or after minor head trauma.

So the correct answer aligns with a biconvex/lens-shaped hematoma from middle meningeal artery injury for epidural, and a crescent-shaped hematoma from bridging veins with slower onset and more common in older patients for subdural. The other descriptions mix up shapes or vessel sources or oversimplify the presentation.