This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain Hemorrhage, Subject name: Medicine
Extradural hemorrhage in NCCT Head 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: Extradural hemorrhage (EDH): Bleeding occurs between skull and dura mater. Occurs due to the rupture of a middle meningeal aery. Lucid interval (Consciousness between two periods of unconsciousness) exists. NCCT head in EDH: Biconvex or flame-shaped hyper-density. Subdural hemorrhage (SDH): Occurs due to rupture of coical bridging veins. In NCCT it shows concavo-convex or sickle-shaped bleed.