Imaging of Posterior fossa lesions - DRE 7 Introduction Lesions at the fourth ventricle Ependymoma Primitive Neuroepithelial tumors (PNET) Medulloblastoma Difference between Ependymoma and Medulloblastoma Lesions at cerebello-pontine angle (CPA) Intra-axial and extra-axial lesion at CPA Acoustic neuroma Cystic schwannoma Meningioma at cerebello-pontine angle Difference between Meningioma and Aneurysm Epidermoid cyst Arachnoid cyst Lesions at Cerebellum Cerebellar hemorrage and infarction Cerebellar abcess Cerebellar tuberculoma Subdural empyema Cerebellar tumors Meningioma at posterior fossa Cerebellar lymphoma Pilocytic astrocytoma Hemangioblastoma Von Hippel-Lindau syndroma Cerebellar deposits Basal ganglia calcification Lesions at brainstem Brain stem hematoma and infarction Multiple sclerosis Tumefactive Multiple sclerosis Brain stem tuberculoma Brain stem glioma Brain stem deposits Osmotic Demyelination Syndrome (central pontine myelinolysis)