Article Sections

Introduction

Brain tumors in adults can originate from various cell types and locations in the brain.  They are classified into primary tumors, which originate in the brain itself, and secondary tumors, which metastasize from other parts of the body.  This article focuses on the different types of primary brain tumors in adults.

The general pathophysiology, epidemiology/risk factors, clinical presentation, diagnosis, and management of primary brain tumors are discussed in more detail in a separate dedicated article.  The diagnosis and management of brain metastases can be found there as well.

Pathophysiology

Brain tumors can be classified according to their cell type of origin.  The brain is composed of 2 major cell types: neurons and glial cells.  Neurons, which transmit information throughout the brain using electrical signals and chemical messengers, rarely form tumors.  Tumors more commonly originate from glial cells, which significantly outnumber neurons and normally provide support to maintain the health of the nervous system.  There are 3 main types of glial cells:

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