This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
Complication of trauma to danger area of face - 
Select and explain. 
A. Cavernous sinus infection, B. Meningitis, C. Visual loss, D. Loss of memory
A: Cavernous sinus infection
Answer: A: Cavernous sinus infection 
Explanation: Ans. is 'a' i.e., Cavernous sinus infection o The area of upper lip and the lowrer part of nose is the danger area of face. It is due to that this area is the common site of infection.o This area is drained by facial vein wrhich communicates with the cavernous sinus through the superior ophthalmic vein and pterygoid venous plexus through the emissary vein,o In case of any infection of this area it may spread to the cavernous sinus causing infection and/or thrombosis.