Sections

Glioblastoma Multiforme

Workup

Laboratory Studies

Currently, no specific laboratory studies are helpful in making a diagnosis of glioblastoma.

Response to adjuvant therapy may be predicted based on the tumor's genetics.

Imaging Studies

Imaging studies of the brain are essential to make the diagnosis of glioblastoma multiforme (GBM). For complete discussion, see Imaging in Glioblastoma Multiforme.

On computed tomography (CT) scans, glioblastomas usually appear as irregularly shaped hypodense lesions with a peripheral ringlike zone of contrast enhancement and a penumbra of cerebral edema.

Magnetic resonance imaging (MRI) with and without contrast is the study of choice (see the images below). These lesions typically have an enhancing ring observed on T1-weighted images and a broad surrounding zone of edema apparent on T2-weighted images. The central hypodense core represents necrosis, the contrast-enhancing ring is composed of highly dense neoplastic cells with abnormal vessels permeable to contrast agents, and the peripheral zone of nonenhancing low attenuation is vasogenic edema containing varying numbers of invasive tumor cells. Several pathological studies have clearly shown that the area of enhancement does not represent the outer tumor border because infiltrating glioma cells can be identified easily within, and occasionally beyond, a 2-cm margin.^[11]

A T1-weighted axial MRI without intravenous contrast. This image demonstrates a hemorrhagic multicentric tumor (glioblastoma multiforme [GBM]) in the right temporal lobe. Effacement of the ventricular system is present on the right, and mild impingement of the right medial temporal lobe can be observed on the midbrain.

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A T1-weighted axial MRI with intravenous contrast. Heterogenous enhancement of the lesion is present within the right temporal lobe. The hypointensity circumscribed within the enhancement is suggestive of necrosis. This radiologic appearance is typical of a multicentric glioblastoma multiforme (GBM).

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A T1-weighted coronal MRI with intravenous contrast. This image demonstrates the lesion (glioblastoma multiforme [GBM]) within the medial temporal lobe and the stereotypical pattern of contrast enhancement.

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A T1-weighted sagittal MRI with intravenous contrast in a patient with glioblastoma multiforme (GBM).

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A T2-weighted axial MRI. The tumor (glioblastoma multiforme [GBM]) and surrounding white matter within the right temporal lobe show increased signal intensity compared to a healthy brain, suggesting extensive tumorigenic edema.

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A fluid-attenuated inversion recovery (FLAIR) axial MRI. This image is similar to the T2-weighted image and demonstrates extensive edema in a patient with glioblastoma multiforme (GBM).

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Positron emission tomography (PET) scans and magnetic resonance (MR) spectroscopy can be helpful to identify glioblastomas in difficult cases, such as those associated with radiation necrosis or hemorrhage. On PET scans, increased regional glucose metabolism closely correlates with cellularity and reduced survival. MR spectroscopy demonstrates an increase in the choline-to-creatine peak ratio, an increased lactate peak, and decreased N- acetylaspartate (NAA) peak in areas with glioblastomas (see the image below).

Magnetic resonance (MR) spectroscopy is representative of a glioblastoma multiforme (GBM), demonstrating a high peak ratio of choline (CHO) to creatine (CR), a decreased N-acetylaspartate (NAA) peak, and an increased lactate (LAC) peak.

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A study by Piroth et al found that O-(2-[(18)F]fluoroethyl-l-tyrosine (FET) PET to measure tumor volume after surgery has a strong prognostic impact.^[12]

Cerebral angiograms are not necessary for the diagnosis or clinical management of glioblastomas.

Other Tests

Electroencephalography (EEG) performed on a patient with glioblastoma multiforme may show generalized diffuse slowing and/or epileptogenic spikes over the area of the tumor. However, findings specific for glioblastoma cannot be observed on EEG.

Procedures

Lumbar puncture is generally contraindicated in the setting of a brain tumor because of the possibility of transtentorial herniation with increased intracranial pressure. However, if ruling out lymphoma, it may be necessary.

CSF studies do not aid significantly in the specific diagnosis of glioblastoma multiforme.

Histologic Findings

As its name suggests, the histopathology of glioblastoma multiforme is extremely variable. Glioblastoma multiformes are composed of poorly differentiated, often pleomorphic astrocytic cells with marked nuclear atypia and brisk mitotic activity. Necrosis is an essential diagnostic feature, and prominent microvascular proliferation is common. Macroscopically, glioblastomas are poorly delineated, with peripheral grayish tumor cells, central yellowish necrosis from myelin breakdown, and multiple areas of old and recent hemorrhages. Most glioblastomas of the cerebral hemispheres are clearly intraparenchymal with an epicenter in the white matter, but some extend superficially and contact the leptomeninges and dura.^{[13, 14, 15, 16, 17, 18, 19]}

Despite the short duration of symptoms, these tumors are often surprisingly large at the time of presentation, occupying much of a cerebral lobe. Undoubtedly, glial fibrillary acidic protein (GFAP) remains the most valuable marker for neoplastic astrocytes. Although immunostaining is variable and tends to decrease with progressive dedifferentiation, many cells remain immunopositive for GFAP even in the most aggressive glioblastomas. Vimentin and fibronectin expression are common but less specific.^[54]

The regional heterogeneity of glioblastomas is remarkable and makes histopathological diagnosis a serious challenge when it is based solely on stereotactic needle biopsies. Tumor heterogeneity is also likely to play a significant role in explaining the meager success of all treatment modalities, including radiation, chemotherapy, and immunotherapy.

Histopathologic slide demonstrating a glioblastoma multiforme (GBM).

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Staging

Completely staging most glioblastomas is neither practical nor possible because these tumors do not have clearly defined margins. Rather, they exhibit well-known tendencies to invade locally and spread along compact white matter pathways, such as the corpus callosum, internal capsule, optic radiation, anterior commissure, fornix, and subependymal regions. Such spread may create the appearance of multiple glioblastomas or multicentric gliomas on imaging studies.

Careful histological analyses have indicated that only 2-7% of glioblastomas are truly multiple independent tumors rather than distant spread from a primary site. Despite its rapid infiltrative growth, the glioblastoma tends not to invade the subarachnoid space and, consequently, rarely metastasizes via cerebrospinal fluid (CSF). Hematogenous spread to extraneural tissues is very rare in patients who have not had previous surgical intervention, and penetration of the dura, venous sinuses, and bone is exceptional.^{[20, 21, 22, 23, 55, 56]}

Treatment & Management

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Media Gallery

Axial CT scan without intravenous contrast. This image reveals a large right temporal intraaxial mass (glioblastoma multiforme [GBM]). Extensive surrounding edema is present, as demonstrated by the peritumoral hypodensity, and a moderate right-to-left midline shift can be noted. All of the radiologic studies in this article are of the same patient.
A T1-weighted axial MRI without intravenous contrast. This image demonstrates a hemorrhagic multicentric tumor (glioblastoma multiforme [GBM]) in the right temporal lobe. Effacement of the ventricular system is present on the right, and mild impingement of the right medial temporal lobe can be observed on the midbrain.
A T1-weighted axial MRI with intravenous contrast. Heterogenous enhancement of the lesion is present within the right temporal lobe. The hypointensity circumscribed within the enhancement is suggestive of necrosis. This radiologic appearance is typical of a multicentric glioblastoma multiforme (GBM).
A T1-weighted coronal MRI with intravenous contrast. This image demonstrates the lesion (glioblastoma multiforme [GBM]) within the medial temporal lobe and the stereotypical pattern of contrast enhancement.
A T1-weighted sagittal MRI with intravenous contrast in a patient with glioblastoma multiforme (GBM).
A T2-weighted axial MRI. The tumor (glioblastoma multiforme [GBM]) and surrounding white matter within the right temporal lobe show increased signal intensity compared to a healthy brain, suggesting extensive tumorigenic edema.
A fluid-attenuated inversion recovery (FLAIR) axial MRI. This image is similar to the T2-weighted image and demonstrates extensive edema in a patient with glioblastoma multiforme (GBM).
Histopathologic slide demonstrating a glioblastoma multiforme (GBM).
Magnetic resonance (MR) spectroscopy is representative of a glioblastoma multiforme (GBM), demonstrating a high peak ratio of choline (CHO) to creatine (CR), a decreased N-acetylaspartate (NAA) peak, and an increased lactate (LAC) peak.

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Author

Jeffrey N Bruce, MD Edgar M Housepian Professor of Neurological Surgery Research, Vice-Chairman and Professor of Neurological Surgery, Director of Brain Tumor Tissue Bank, Director of Bartoli Brain Tumor Laboratory, Department of Neurosurgery, Columbia University College of Physicians and Surgeons

Jeffrey N Bruce, MD is a member of the following medical societies: Alpha Omega Alpha, American Association for the Advancement of Science, American Association of Neurological Surgeons, American Society of Clinical Oncology, Congress of Neurological Surgeons, New York Academy of Sciences, North American Skull Base Society, Pituitary Society, Society for Neuro-Oncology, Society of Neurological Surgeons

Disclosure: Received grant/research funds from NIH for other.

Coauthor(s)

Benjamin C Kennedy, MD Assistant Professor of Neurosurgery, Perelman School of Medicine at the University of Pennsylvania; Director of Epilepsy and Functional Neurosurgery, The Children’s Hospital of Philadelphia

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.

Chief Editor

Herbert H Engelhard, III, MD, PhD, FACS, FAANS Affiliated Professor of Bioengineering, University of Illinois at Chicago

Herbert H Engelhard, III, MD, PhD, FACS, FAANS is a member of the following medical societies: American Association for Cancer Research, American Association of Neurological Surgeons, American College of Surgeons, American Medical Association, Congress of Neurological Surgeons, Illinois State Medical Society

Disclosure: Nothing to disclose.

Additional Contributors

Robert C Shepard, MD, FACP Associate Professor of Medicine in Hematology and Oncology at University of North Carolina at Chapel Hill; Vice President of Scientific Affairs, Therapeutic Expertise, Oncology, at PRA International

Robert C Shepard, MD, FACP is a member of the following medical societies: American Association for Cancer Research, American Association for Physician Leadership, European Society for Medical Oncology, Association of Clinical Research Professionals, American Federation for Clinical Research, Eastern Cooperative Oncology Group, Society for Immunotherapy of Cancer, American Medical Informatics Association, American College of Physicians, American Federation for Medical Research, American Medical Association, American Society of Hematology, Massachusetts Medical Society

Disclosure: Nothing to disclose.

Acknowledgements

We would like to acknowledge previous contributions to this chapter from Katharine Cronk, MD,PhD; Richard C Anderson, MD; Chris E Mandigo, MD; Andrew T Parsa MD, PhD; Patrick B Senatus, MD, PhD; and Allen Waziri, MD.

Glioblastoma Multiforme Workup

Laboratory Studies

Imaging Studies

Other Tests

Procedures

Histologic Findings

Staging

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