This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain Imaging: Inflammatory, Infectious, and Vascular Diseases, Subject name: Radiology
Epidermoid cyst can be differentiated from arachnoid cyst by - 
Select and explain. 
A. MRI, B. USG, C. Myelography, D. CT scan
A: MRI
Answer: A: MRI 
Explanation: Ans. is 'a' i.e., MRI o Myelography cannot differentiate reliably between an epidermoid cyst and a noncommunicating arachnoid cyst,o It has largely been replaced by MRI.