Mehlman High Yield Risk Factors Practice Test

Which CT finding is typical of an epidural hematoma?

Biconvex-shaped Crescent-shaped Diffuse hypodense Ring-enhancing lesion

Correct Answer:

Biconvex-shaped

Explanation:

Epidural hematomas on CT are classically a biconvex (lens-shaped) hyperdense collection between the skull and the dura. This shape comes from bleeding, usually arterial (often from the middle meningeal artery) after trauma, and the hematoma is confined by the sutures of the skull, so it tends to have that characteristic lens appearance rather than spreading along the surface. The other patterns point to different processes: a crescent-shaped collection is typical for a subdural hematoma, a diffuse hypodense area suggests generalized brain edema or chronic changes, and a ring-enhancing lesion is more consistent with an abscess or tumorous lesion that has developed a contrast ring.

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