CT, contrast CT, MRI, functional MRI, SPECT, CTA, and x-ray as tools to identify pathogens and diagnose intracranial infections are presented. Topics include: Epidemiology of Central Nervous System Infections; Imaging of Cranial Meningitis and Ventriculitis; Encephalitis, Cerebritis and Brain Abscess; Imaging of Central Nervous System Tuberculosis; Imaging of Rickettsial, Spirochetal, and Parasitic Infections; Imaging of Neurocysticercosis; Fungal Infections of the Central Nervous System; Central Nervous System Infections in the Pediatric Population; Imaging of Infectious Diseases of Spine; Neuropathological Findings in Intracranial Infections; Neurosurgical Approach to Infectious Disease of the Brain; Head and Neck Infections.