<prompt> A 48-years old woman comes with bilateral progressive weakness of both lower limbs, spasticity and mild impairment of respiratory movements. MRI shows an intradural mid-dorsal midline enhancing lesion. What is the diagnosis?Intradural lipomaMeningiomaNeuroenteric cystDermoid cyst  <response>: Ans. b MeningiomaCNS tumors can be Intra axial or Extra axial:Intra axial: Neuronal Astrocytoma Lymphoma Extra axial: Pituitary Schwannoma Meningioma 