This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cerebrovascular, Subject name: Medicine
Extradural hemorrhage is seen as: 
Select and explain. 
A. Hyperdense biconvex, B. Hypodense biconcave, C. Hyperdense biconcave, D. Hypodense biconvex
A: Hyperdense biconvex
Answer: A: Hyperdense biconvex 
Explanation: Ans. (a) Hyperdense biconvexRef: Harrison's 17th ed. Ch 364* Extradural hemorrhage: Bleeding occurs between skull and duramatter. Bleeding occurs due to the rupture ofMiddle meningeal artery. Lucid Interval (Consciousness between two periods of unconsciousness) exists.* In NCCT it shows hyperdensity bleeding, bi-convex or flame shaped bleed.* Treatment: Burr hole surgery.* Subdural hemorrhage: Occurs due to rupture of Cortical bridging veins. In NCCT it shows concavo- convex or sickle shaped bleed.