This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
This lesion is seen in which condition: 
Select and explain. 
A. NF1, B. NF2, C. Tuberous sclerosis, D. VHL
B: NF2
Answer: B: NF2 
Explanation: Ans. B. NF2a. The image is of acoustic neuroma. This is noncancerous growth which develops on the inferior vestibular nerve. These tumors usually grow slowly over a period of years. These do not invade the brain & usually affects cranial nerves, Vth, VIth, VIIth, VIIIth.b. Earliest nerve to get involve is Vth nerve. Earlies sign is loss of corneal reflex.