This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
A 25-yrs-old female presented with lower limb weakness, spasticity, urinary hesitancy, mid-dorsal intradural enhancing mass seen in MRI. What is the diagnosis? 
Select and explain. 
A. Intradural lipoma, B. Meningioma, C. Dermoid cyst, D. Neuroepithelial cyst
B: Meningioma
Answer: B: Meningioma 
Explanation: Ans. Meningioma