Circumscribed Astrocytic Gliomas Main Text Preamble In the 2021 5th edition WHO, circumscribed astrocytic gliomas are a separate group within gliomas, glioneuronal and neuronal tumors. Circumscribed Astrocytomas Preamble Six neoplasms…
Posterior Fossa Malformations Main Text Preamble Neural structures in the midbrain and posterior fossa are derived from three sources: (1) The embryonic mesencephalon gives rise to midbrain structures. (2) The…
Approach to Toxic, Metabolic, Degenerative, and CSF Disorders Main Text Preamble Metabolic disorders are relatively uncommon but important diseases in which imaging can play a key role in early diagnosis…
Miscellaneous Tumors and Tumor-Like Conditions Main Text Preamble Some important neoplasms that affect the calvaria, skull base, and cranial meninges are not included in the 2021 5th edition WHO classification…
Adult-Type Diffuse Gliomas Main Text Preamble Gliomas, glioneuronal tumors, and neuronal tumors are the most common and most varied neoplasms that affect the brain parenchyma. Of the six different groups…
Anomalies of the Skull and Meninges Main Text Preamble Anomalies of the skull and meninges represent maldevelopment of the embryonic mesenchyme. These include cephaloceles, congenital calvarial defects, and other meningeal…
Hematolymphoid and Hematopoietic Tumors Main Text Preamble This chapter focuses on hematopoietic tumors and tumor-like conditions. We begin with an increasingly common group of neoplasms, lymphomas and related disorders, then…
Choroid Plexus Tumors Main Text Preamble The 5th edition WHO separates choroid plexus tumors from gliomas, glioneuronal tumors, and neuronal tumors. Choroid plexus neoplasms are now considered as their own…
Holoprosencephalies, Related Disorders, and Mimics Main Text Preamble Holoprosencephalies and variants, such as syntelencephaly, are classified as anomalies of ventral prosencephalon development. Other anomalies of the ventral prosencephalon include septo-optic…
