A 20-year-old man after head trauma has non-contrast CT showing a biconvex hyperdense extra-axial collection over the right frontotemporal convexity that stops at the coronal suture. Which vascular structure is most commonly responsible for this type of hemorrhage?
- A Bridging cortical veins
- B Middle meningeal artery ✓
- C Anterior communicating artery
- D Superior sagittal sinus
Correct answer: B. Middle meningeal artery
Explanation
The biconvex, lens-shaped collection that respects cranial suture margins is an extradural (epidural) hematoma, most often arising from laceration of the middle meningeal artery in the temporoparietal region. Bridging cortical veins are torn in subdural hematoma, which appears as a concave, crescentic collection crossing suture lines. The anterior communicating artery produces subarachnoid and intraparenchymal hemorrhage rather than an extradural collection.
Reference: Grainger and Allison's Diagnostic Radiology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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