Trauma Trauma Overview Primary Effects of CNS Trauma Secondary Effects and Sequelae of CNS Trauma Nontraumatic Hemorrhage and Vascular Lesions Approach to Nontraumatic Hemorrhage and Vascular Lesions Spontaneous Parenchymal Hemorrhage Subarachnoid Hemorrhage and Aneurysms Vascular Malformations Arterial Anatomy and Strokes Venous Anatomy and Occlusions Vasculopathy Infection, Inflammation, and Demyelinating Diseases Approach to Infection, Inflammation, and Demyelination Congenital, Acquired Pyogenic, and Acquired Viral Infections Tuberculosis and Fungal, Parasitic, and Other Infections HIV/AIDS Demyelinating and Inflammatory Diseases Neoplasms, Cysts, and Tumor-Like Lesions Introduction to Neoplasms, Cysts, and Tumor-Like Lesions Astrocytomas Nonastrocytic Glial Neoplasms Neuronal and Glioneuronal Tumors Pineal and Germ Cell Tumors Embryonal Neoplasms Tumors of the Meninges Cranial Nerves and Nerve Sheath Tumors Lymphomas and Hematopoietic and Histiocytic Tumors Sellar Neoplasms and Tumor-Like Lesions Miscellaneous Tumors and Tumor-Like Conditions Metastases and Paraneoplastic Syndromes Nonneoplastic Cysts Toxic, Metabolic, Degenerative, and CSF Disorders Approach to Toxic, Metabolic, Degenerative, and CSF Disorders Toxic Encephalopathy Inherited Metabolic Disorders Acquired Metabolic and Systemic Disorders Dementias and Brain Degenerations Hydrocephalus and CSF Disorders Congenital Malformations of the Skull and Brain Embryology and Approach to Congenital Malformations Posterior Fossa Malformations Commissural and Cortical Maldevelopment Holoprosencephalies, Related Disorders, and Mimics Familial Cancer Predisposition Syndromes Vascular Neurocutaneous Syndromes Anomalies of the Skull and Meninges