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Neurologic Manifestations of Glioblastoma Multiforme

  • Author: ABM Salah Uddin, MD; Chief Editor: Stephen A Berman, MD, PhD, MBA  more...
 
Updated: Nov 09, 2015
 

Background

Glioblastoma multiforme (GBM) is the most common and most aggressive of the primary brain tumors. The current World Health Organization (WHO) classification of primary brain tumors lists GBM as a grade IV astrocytoma.[1] Astrocytoma is one of 3 distinct types of gliomas in the brain, although mixed cell types occur as well. GBMs are highly malignant, infiltrate the brain extensively, and at times may become enormous before turning symptomatic. See the image below.

T1-weighted axial gadolinium-enhanced MRI demonstr T1-weighted axial gadolinium-enhanced MRI demonstrates an enhancing tumor of the right frontal lobe. Image courtesy of George Jallo, MD.

 

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Pathophysiology

GBM is an anaplastic, highly cellular tumor with poorly differentiated, round, or pleomorphic cells, occasional multinucleated cells, nuclear atypia, and anaplasia. Under the modified WHO classification, GBM differs from anaplastic astrocytomas (AA) by the presence of necrosis under the microscope. Variants of the tumor include gliosarcoma, multifocal GBM, or gliomatosis cerebri (in which the entire brain may be infiltrated with tumor cells). These variants, however, do not alter the prognosis of the tumor. Multifocal metastasis of GBM, including far distant spinal drop metastasis in patients treated with antiangiogenic chemotherapy[2] , is extremely rare but is increasing. Two reasons for the metastasis are an antiangiogenic therapy – induced activation of glioma invasion[3] and the fact that patients are living longer.[4]

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Epidemiology

Frequency

Among primary brain tumors, malignant astrocytomas are the most common in all age groups. (However, among all brain tumors, metastases are the most common.) GBMs are the most common primary brain tumors in adults, accounting for 12-15% of intracranial tumors and 50-60% of primary brain tumors. Several authors have reported a true increase in the incidence of brain tumors, especially among the elderly, and many have attributed the observed changes to developments in diagnostic imaging or changes in the classification system.[5]

International incidence of GBM is similar to that of the United States.

Mortality/Morbidity

Morbidity is from the tumor location, progression, and pressure effects. The overall prognosis for GBM has changed little in the past 2 decades, despite major improvements in neuroimaging, neurosurgery, radiation treatment techniques, adjuvant chemotherapy, and supportive care. Few patients with GBM survive longer than 3 years and only a handful survive 5 years. Previously reported long-term survivors of GBM may be patients diagnosed with GBM who actually harbor low-grade glioma, pleomorphic xanthoastrocytoma, ganglioglioma, or other lesions. Occasional patients with a single necrotic, demyelinating plaque of multiple sclerosis also may be misdiagnosed with GBM, especially if only CT scans are obtained.

Race-, sex-, and age-related demographics

High-grade astrocytomas (HGAs) are slightly more common in whites than in blacks, Latinos, and Asians.

GBM is slightly more common in men than in women; the male-to-female ratio is 3:2.

While GBM occurs in all age groups, its incidence is increasing in elderly patients. A true increase in incidence of primary brain tumors exists, which cannot be explained by the aging population, better imaging techniques, or earlier detection at surgery.

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Contributor Information and Disclosures
Author

ABM Salah Uddin, MD Private Practice, Norwood Neurology; Consulting Staff, Department of Neurology, St Vincent's Hospital

ABM Salah Uddin, MD is a member of the following medical societies: American Academy of Neurology, American Epilepsy Society, American Medical Association

Disclosure: Nothing to disclose.

Coauthor(s)

Tambi Jarmi, MD Resident Physician, Department of Internal Medicine, Carraway Methodist Medical Center

Tambi Jarmi, MD is a member of the following medical societies: American College of Physicians, American Medical Association

Disclosure: Nothing to disclose.

Specialty Editor Board

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Jorge C Kattah, MD Head, Associate Program Director, Professor, Department of Neurology, University of Illinois College of Medicine at Peoria

Jorge C Kattah, MD is a member of the following medical societies: American Academy of Neurology, American Neurological Association, New York Academy of Sciences

Disclosure: Nothing to disclose.

Chief Editor

Stephen A Berman, MD, PhD, MBA Professor of Neurology, University of Central Florida College of Medicine

Stephen A Berman, MD, PhD, MBA is a member of the following medical societies: Alpha Omega Alpha, American Academy of Neurology, Phi Beta Kappa

Disclosure: Nothing to disclose.

Acknowledgements

The authors and editors of Medscape Reference gratefully acknowledge the contributions of previous author Subramanian Hariharan, MD, to the development and writing of this article.

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T1-weighted axial gadolinium-enhanced MRI demonstrates an enhancing tumor of the right frontal lobe. Image courtesy of George Jallo, MD.
T2-weighted image demonstrates notable edema and midline shift. This finding is consistent with a high grade or malignant tumor. Image courtesy of George Jallo, MD.
Histopathologic slide demonstrating a glioblastoma multiforme.
Magnetic resonance spectroscopy is representative of a glioblastoma multiforme.
 
 
 
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