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 48 yr old woman comes with b/1 progressive weakness of both lower limbs, spasticity & mild impairment of respiratory movements. MRI shows an intradural mid-dorsal midline enhancing lesion. What is the likely diagnosis: 
Select and explain. 
A. Intradural lipoma, B. Meningioma, C. Neuroenteric cyst, D. Dermoid cyst
B: Meningioma
Answer: B: Meningioma 
Explanation: B i.e. Meningioma