Infection and Inflammation
10.1055/b-0034-102665 Infection and Inflammation Parenchymal Abscess The typical appearance on MR and CT of a brain abscess is that of a round mass lesion with central necrosis, demonstrating a distinctive…
NEUROLOGICAL IMAGING
Vascular Lesions
10.1055/b-0034-102664 Vascular Lesions Aneurysms The incidence in the normal population of saccular (berry) aneurysms differs widely between reports, but is likely well below 5%. They are multiple in 15% of…
Cerebrospinal Fluid Disorders
10.1055/b-0034-102669 Cerebrospinal Fluid Disorders Obstructive Hydrocephalus, Intraventricular This entity is defined by obstruction proximal to the foramina of Luschka and Magendie. It can be acute or chronic (compensated) ( Fig….
Nonneoplastic Cysts
10.1055/b-0034-102668 Nonneoplastic Cysts Arachnoid Cyst Arachnoid cysts are common, benign, CSF filled lesions. They represent 1% of all intracranial masses. In terms of etiology, they can be congenital, inflammatory, or…
Congenital Malformations
10.1055/b-0034-102655 Congenital Malformations MR is the modality of choice for evaluation of all congenital malformations of the brain, with the exception of the craniosynostoses. In individual instances, some findings may…
Infarction
10.1055/b-0034-102661 Infarction In young patients, the etiologies for cerebral infarction are many and varied, in distinction to adults. Leading causes include congenital and acquired heart disease, together with sickle cell…
Normal Anatomy and Common Variants
10.1055/b-0034-102654 Normal Anatomy and Common Variants Normal Intracranial Anatomy The frontal lobe is demarcated posteriorly from the parietal lobe by the central sulcus ( Fig. 1.1 ). On axial magnetic…
Dementia and Degenerative Disease
10.1055/b-0034-102662 Dementia and Degenerative Disease Alzheimer Disease Alzheimer disease is today the most common diagnosed cause of dementia. Histology is nonspecific. CT and MR imaging signs are nonspecific, with generalized…
Hemorrhage
10.1055/b-0034-102658 Hemorrhage Parenchymal Hemorrhage Hemorrhage has a specific but varied appearance on MR, dependent on time frame ( Fig. 1.40 ). The appearance is much more straightforward on CT. In…
