Radiology of CNS Infection 华中科技大学同济医学院 同济医院放射科 陈唯唯 InfectionsInfections 1 Intracranial infections include abscess meningitis and encephalitis 2 Infections can be caused by pyogenic tuberculous viral or parasitic organisms 3 They may lie within brain parenchyma the subdural or epidural spaces or may involve compartment 4 CT and MRI play important roles in the early diagnosis of infections Pyogenic MeningitisPyogenic Meningitis Haemophilus Influenzae type B Hib Meningococcus Pneumococcus Etiological agents leading causes 2 3 No 1 No 2 No 3 Epidemic cerebrospinal meningitis Clinical findings of meningitis Signs and symptoms uFever uHeadache uAltered mental status lethargy to coma uNeck stiffness uIncreased intracranial pressure nausea vomiting bulging fontanelle in infants papilledema 视乳头水肿 uMeningeal irritation Nuchal rigidity and Brudzinski s and Kernig s signs