The new england journal of medicine

case records of the massachusetts general hospital
Founded by Richard C. Cabot
Nancy Lee Harris, m.d., Editor
Jo-Anne O. Shepard, m.d., Associate Editor
Sally H. Ebeling, Assistant Editor

Stacey M. Ellender, Assistant Editor
Christine C. Peters, Assistant Editor

Case 33-2004: A 34-Year-Old Man with a Seizure
and a Frontal-Lobe Brain Lesion
Emad N. Eskandar, M.D., Jay S. Loeffler, M.D., Alison M. O’Neill, M.D.,
George J. Hunter, M.D., and David N. Louis, M.D.

presentation of case
A 34-year-old man was admitted to the hospital because of a seizure and a lesion in the
frontal lobe of the brain.
The patient had a history of obstructive sleep apnea for which he used a continuouspositive-airway-pressure (CPAP) machine at night. On the morning of admission, a
friend found him unresponsive on the floor with his CPAP mask in place. When the
mask was removed, he was frothing at the mouth and had jerking movements of the
arms and legs. Emergency services personnel were called, and en route to the hospital
he was seen to have an additional generalized seizure.
The patient had had deep venous thrombosis of the left leg two and a half years earlier, which had been treated by thrombectomy. This condition had been followed by
chronic venous insufficiency. The patient worked as a consultant, and his job required
frequent air travel. He had smoked one pack of cigarettes per week for several years and
reported moderate alcohol intake on weekends. The patient’s father had a diagnosis of
Parkinson’s disease, but there was no other family history of neurologic disease or cancer; his mother and siblings were well.
The initial neurologic evaluation in the emergency department showed that the patient was obtunded, could be roused by voice, and was oriented to his name, but he was
able to follow commands only intermittently. Funduscopic examination was limited
but suggested papilledema in the right eye. The pupils were round and equal; they constricted from 5 mm to 2 mm on exposure to light. Eye movements were full with oculocephalic maneuvers. Corneal reflexes were suppressed bilaterally. There was no facial
asymmetry. The patient moved his arms and legs vigorously and symmetrically and
withdrew them appropriately in response to noxious stimuli. Deep-tendon reflexes
were graded 1+ and the responses were symmetric throughout; there was bilateral extensor plantar response (Babinski’s reflex was present).
Phenytoin was administered, and the patient’s mental status returned to normal
over the next several hours. Computed tomographic (CT) scanning of the head disclosed an ill-defined area of low attenuation in the right frontal lobe with local mass effect. The patient was admitted to the hospital. A magnetic resonance imaging (MRI)
scan was obtained later in the day, which further characterized the imaging abnor-

n engl j med 351;18

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From the Neurosurgical Service (E.N.E.),
and the Departments of Radiation Oncology (J.S.L.), Neurology (A.M.O.), Radiology (G.J.H.), and Pathology (D.N.L.), Massachusetts General Hospital and Harvard
Medical School.
N Engl J Med 2004;351:1875-82.
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mality as an infiltrative, nonenhancing, heterogeneous lesion; it appeared hypointense on T1-weighted sequences and hyperintense on T2-weighted
sequences.
A diagnostic procedure was performed on the
third hospital day.

differential diagnosis
Dr. George J. Hunter: CT scans of the head obtained
when the patient was in the emergency department
showed a heterogeneous region of low attenuation
in the right frontal lobe, without evidence of enhancement after administration of contrast material. There was mass effect on the adjacent structures
with no evidence of calcification in relation to the
lesion, suggesting that this was a tumor rather than
a territorial infarction. MRI of the brain was performed. T1-weighted sequences were obtained in
multiple planes before and after the administration of contrast material; images were obtained in
the axial plane before the administration of contrast material with T2-weighted and fluid-attenuated inversion recovery (FLAIR) sequences; and
magnetic resonance spectroscopy was performed
over both frontal lobes.
There is a heterogeneous, infiltrative mass in
the right frontal lobe involving both gray and white
matter (Fig. 1A and 1B). The bulk of the lesion has
signal characteristics of solid tissue — namely,
bright on the T2-weighted and FLAIR sequences
and isointense to slightly hypointense to the gray
matter on the T1-weighted sequences. There is a
small region just behind and lateral to the center
of the lesion that is bright on the T2-weighted sequences and dark on the FLAIR and T1-weighted
sequences; this represents a cystic component
(Fig. 1A, arrow). There is no appreciable enhancement. There is mass effect on the adjacent ventricle and minimal midline shift. Some subtle abnormal T2 signal is visible along the genu of the corpus
callosum, suggesting infiltration in this area. At
this stage, the differential diagnosis included a
low-grade astrocytic tumor and a low-grade oligodendroglioma.
The metabolic structure of this lesion was investigated with magnetic resonance spectroscopy,
with a focus on three key metabolites: N-acetyl aspartate, choline, and creatine. In a nuclear resonance magnetic spectrum from a normal brain, the
N-acetyl aspartate peak is dominant, and the ratio
of the choline peak to the creatine peak is less than

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2:1. In tumors, the level of N-acetyl aspartate is depressed, as there is little or no neuronal tissue, and
the ratio of choline to creatine increases. The causes of increased choline are incompletely understood but include proliferation of cell membranes
and breakdown of phosphatidylcholine, which releases choline that is visible with magnetic resonance spectroscopy.
A choline-to-creatine ratio greater than 2:1 is
considered abnormal, and a ratio greater than 3:1
is suggestive of a malignant lesion. Low-grade astrocytic or oligodendroglial tumors usually have a
choline-to-creatine ratio of less than 3:1, whereas
higher-grade tumors have a ratio greater than 3:1.
Figure 2A shows a color map of the choline-to-creatine ratio over a T1-weighted image, in which a single focus where the choline-to-creatine ratio is more
than 4:1 can be seen just lateral to the cystic area
(arrow). The spectrum from this region is shown at
the top in Figure 2B, and compared with the spectrum from a region of a normal brain (bottom). The
finding of a region of higher metabolic activity within a predominantly low-grade tumor suggests either
an astrocytic tumor, grade 2 to 3, or a low-grade oligodendroglioma with anaplastic components.
Dr. Emad N. Eskandar: This is a relatively young,
previously healthy patient with a new onset of seizures. The MRI revealed a nonenhancing right frontal-lobe lesion with some mass effect. The clinical
presentation and overall appearance of this lesion
were consistent with features of a primary brain
tumor. The most likely candidates were an astrocytoma and an oligodendroglioma, although other less common tumors were also possible. Other
causes, such as infection, an infarct, trauma, or a
congenital abnormality, were less likely.
Given the clinical and radiologic information,
the first decision was whether to perform a stereotactic biopsy or a craniotomy and resection of the
lesion. A stereotactic biopsy is usually performed
with the patient awake and involves placing the patient in a stereotactic frame, obtaining an MRI or
CT scan, computing the coordinates of the lesion,
and then obtaining several small tissue samples
through a burr hole for diagnostic purposes. A craniotomy is usually performed under general anesthesia and allows the physicians to obtain a specimen for diagnostic purposes as well as to resect the
tumor, thereby gaining some therapeutic benefit.
A number of factors come into play in deciding
whether to proceed first with a stereotactic biopsy
or to perform a craniotomy (Table 1). Indications

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case records of the massachusetts general hospital

A

B

C

D

Figure 1. MRI Scans of the Brain Obtained at the Time of Diagnosis and after Treatment.
A fluid-attenuated inversion recovery (FLAIR) image (Panel A) shows a heterogeneous, infiltrative mass in the right frontal lobe involving both gray and white matter. The bulk of the lesion has signal characteristics of solid tissue — bright on
the T2-weighted and FLAIR sequences, and isointense to slightly hypointense to the gray matter on the T1-weighted sequences (Panel B). There is a small cystic component just behind and lateral to the center of the lesion that is bright on
T2-weighted and dark on FLAIR and T1-weighted sequences (arrow, Panel A). Mass effect on the adjacent ventricle and
minimal midline shift are evident. A FLAIR image (Panel C) obtained after the surgical debulking shows the residual tumor (bright signal). Another FLAIR image (Panel D) after four cycles of procarbazine, lomustine, and vincristine combination chemotherapy shows only a small residual focus of bright signal. This region did not enhance with gadolinium
contrast medium, and magnetic resonance spectroscopy showed no evidence of tumor.

for the stereotactic biopsy as the first procedure include the following: deep-seated tumors that are
not amenable to resection; lesions in which the radiologic and clinical findings are ambiguous; diffuse lesions; multiple lesions; an appearance that
suggests a lymphoma, which would not require re-

n engl j med 351;18

section; a change in the appearance of a previously
diagnosed or treated tumor; and a wish to assess
tumors after treatment (e.g., to distinguish between radiation necrosis and tumor recurrence).
The choice may also be dictated by the patient’s overall condition; for instance, the patient may be too

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Table 1. Relative Indications for Stereotactic Biopsy
as Compared with Craniotomy as a First Procedure.

A

B
Creatine

NAA

Choline

Figure 2. Magnetic Resonance Spectroscopy for N-Acetyl
Aspartate (NAA), Choline, and Creatine.
A color map of the choline-to-creatine ratio is shown
over a T1-weighted image (Panel A). A single focus in
which the choline-to-creatine ratio is greater than 4:1
can be seen just lateral to the cystic area (arrow), indicating a region of higher metabolic activity within a predominantly low-grade tumor. The spectrum from this region
is shown at the top of Panel B and compared with that
of a region of a normal brain (bottom). Both the creatine
peak and the NAA peak are lower in the tumor than in
the normal brain.

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Stereotactic Biopsy

Craniotomy

Deep-seated tumor

Superficial tumor

Unresectable tumor

Resectable tumor

Multiple lesions

Single lesion

Unclear appearance in
radiologic images

Clear appearance in
radiologic images

Change in appearance

New diagnosis

No mass effect

Mass effect

Normal intracranial pressure

Raised intracranial
pressure

Patient with systemic
disease

Healthy patient

Diagnostic potential

Diagnostic and therapeutic potential

ill to tolerate a craniotomy. In addition to providing
the opportunity to obtain diagnostic tissue, a stereotactic operation may in some cases make it possible to deliver radiotherapy or other antitumor
agents to the lesion, although these approaches are
still experimental.
A craniotomy provides the opportunity for diagnosis and treatment in one operation. Indications
for craniotomy include lesions that appear to be
surgically resectable and that are in accessible and
relatively “silent” areas of the brain or in areas of
the brain in which a mild postoperative neurologic
deficit is considered acceptable to the patient and
the clinicians, an appearance consistent with tumor on the MRI, and large tumors exerting mass
effect. Resecting the bulk of the tumor reduces the
overall tumor burden, reduces intracranial pressure
along with mass effect, and possibly potentiates the
effects of adjuvant therapies such as chemotherapy
and radiation. Finally, brain tumors are not uniform
and can have areas of higher grade mixed in with
areas of lower grade. Since the overall behavior of
the tumor is determined by its most malignant areas, resection makes possible a more complete sampling of the lesion.
The goal of surgery is to resect safely as much of
the tumor as possible, with a complete resection of
all gross tumor being the ideal outcome. Intraoperative delineation of tumor boundaries is often difficult because gliomas are by nature infiltrative and
clear boundaries may not exist. There are a number
of approaches to help guide intraoperative tumor

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case records of the massachusetts general hospital

resection, including frameless stereotaxy, intraoperative imaging, and other experimental techniques that capitalize on the biologic differences
between tumor tissue and brain tissue. There are
advantages and disadvantages associated with each
of these techniques (Table 2).
This patient had a tumor in the right frontal
lobe that was readily accessible and had a radiologic appearance that was consistent with a primary
brain tumor. There was mass effect that had led to
seizures, so the decision was made to perform a craniotomy. An intraoperative, frameless stereotactic
system was used to guide the tumor resection. The
patient underwent a right frontal craniotomy and
resection of the right frontal pole along with the
tumor. The tumor had a slightly gray color and a
somewhat firm texture, which were only subtly different from the surrounding brain tissue. The resection was carried inferiorly to the floor of the anterior cranial fossa and medially to the falx cerebri.
The result of analysis of an intraoperative frozen
section was consistent with low-grade glioma. At
the completion of surgery we believed that we had
achieved our goals, which were to obtain tissue for
diagnosis and to debulk the tumor safely.
The patient had a smooth recovery. However, the
postoperative MRI showed a small amount of residual disease. At that point, the options were a second operation for further resection or treatment
with radiation and chemotherapy. Although the extent of resection is correlated with improved survival in higher-grade tumors, there is no evidence
that a second operation imparts further benefit in
this situation.1-4 Since there is evidence that certain subtypes of oligodendroglioma respond particularly well to chemotherapy, we elected to wait
for the results of the pathological examination and
genetic testing before deciding on the next step.5-7

pathological discussion
Dr. David N. Louis: This tumor is a diffusely infiltrating glioma with the classic features of oligodendroglioma, which include a monomorphic population of cells with rounded nuclei and perinuclear
halos as well as a delicate branching vasculature
(Fig. 3A). In some regions, the tumor has markedly increased cell density, high mitotic activity, microvascular proliferation, nuclear pleomorphism,
and numerous apoptotic cells (Fig. 3B). An immunohistochemical evaluation using MIB-1 antibody
technology, which labels dividing cells, demonstrat-

n engl j med 351;18

Table 2. Comparison of Intraoperative Guidance Techniques.
Technique

Advantages

Disadvantages

Frame-based stereotaxy

Excellent resolution

Cumbersomeness

Excellent accuracy

Difficulty in assessing
boundaries

Established technology

Brain shift during operation

Good resolution

Brain shift during operation

Frameless stereotaxy

Ease of use
Intraoperative CT

Intraoperative MRI

Real-time imaging

Cumbersomeness

Geometric accuracy

Less anatomical detail
than MRI

Real-time imaging

High cost

Good anatomical detail

Specialized equipment
needed

ed a proliferation index of 11 percent. All these
histologic features are diagnostic of an anaplastic
oligodendroglioma, categorized according to the
system of the World Health Organization (WHO) as
WHO grade III.
DNA was extracted from the formalin-fixed, paraffin-embedded tumor tissue, as well as from peripheral-blood leukocytes. The constitutional and
blood DNA was amplified with a polymerase-chainreaction assay and compared at three polymorphic
markers on the short arm of chromosome 1 (1p)
and at three polymorphic markers on the long arm
of chromosome 19 (19q). These assays demonstrated allelic loss (“loss of heterozygosity”) for
both 1p and 19q (Fig. 4).
For anaplastic oligodendrogliomas, the therapeutic relevance of molecular subtyping has been
demonstrated.5-7 No clinical or pathological feature predicts response reliably, whereas allelic loss
of chromosome 1p is a powerful predictor of a response to combination chemotherapy with procarbazine, lomustine, and vincristine, and the combined loss of 1p and 19q is a strong predictor of
longer survival.5-7 We have divided anaplastic oligodendrogliomas into four therapeutically and prognostically relevant subgroups.6 Patients whose tumors have combined but isolated losses of 1p and
19q tend to have marked and durable responses
associated with long survival, with or (in some cases) without postoperative radiation therapy. Other
tumors with chromosome 1p alterations also respond to chemotherapy, but with a shorter dura-

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N

A

T

B
Figure 4. Loss of Heterozygosity.
An autoradiograph shows allelic loss at a polymorphic
locus on the short arm of chromosome 1 (D1S199) when
tumor (T) and blood (N) DNA are compared. Note the
loss of the upper allele (arrow) in the tumor DNA.

Figure 3. Brain-Biopsy Specimen (Hematoxylin and Eosin).
The specimen from the patient had the classic appearance of an oligodendroglioma, which features infiltrating glioma cells with rounded nuclei and perinuclear
halos (Panel A). Some regions had marked hypercellularity, anaplastic nuclei, mitotic figures, and apoptotic
cells (Panel B); together, these features are diagnostic
of anaplastic oligodendroglioma.

tion of response and shorter survival. Tumors lacking loss of 1p can be divided into two subgroups:
those with a TP53 mutation, which often respond
to chemotherapy but recur quickly; and those without a TP53 mutation, which are poorly responsive,
aggressive tumors. These results suggest that genetic analysis can be used to tailor therapy at the
time of diagnosis.
For glioblastomas, genetic subgroups have also
been defined on the basis of mutually exclusive gene
alterations: for example, one subgroup features
frank amplification of the epidermal growth factor–receptor (EGFR) gene, as compared with a subgroup that has a TP53 mutation and allelic loss of
chromosome 17p.8-10 The glioma pathway that
includes TP53 inactivation is characteristic of (but
not restricted to) glioblastomas that have arisen
in younger adults through malignant progression

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from a lower-grade astrocytoma9,10 and of giantcell glioblastomas.11 Glioblastomas with EGFR amplification, in contrast, most often occur in older
patients with a short clinical history and no definite
prior lower-grade astrocytoma9,12 and in those with
a small-cell phenotype.13 Although the relationships between the glioblastoma genotype and clinical features are complex,14 the ability of molecular
techniques to detect biologic heterogeneity in glioblastomas raises the possibility that new approaches to overall classification and therapy of gliomas
could be based on objective biologic variables.
As a result of these studies, clinical testing for
loss of chromosome 1p and 19q can be recommended for patients with anaplastic oligodendrogliomas, for patients with small-cell malignant tumors in which the differential diagnosis includes
anaplastic oligodendroglioma rather than smallcell glioblastoma, as well as for selected patients
with grade II oligodendrogliomas for whom decisions about therapy might be influenced by additional knowledge about the probable behavior of
the tumor.

discussion of management
Dr. Alison M. O’Neill: The management of anaplastic
oligodendrogliomas is a multidisciplinary clinical
field. The area in which the most change has occurred in the past several years has been in the role
of chemotherapy in the treatment of these tumors

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case records of the massachusetts general hospital

and, in particular, the identification of subgroups
of patients who will respond well to chemotherapy.
In the late 1980s, Cairncross and Macdonald
reported that some patients with malignant oligodendroglial tumors responded much more briskly
to chemotherapy, in particular combination chemotherapy with procarbazine, lomustine, and vincristine, than patients with other types of malignant
glial tumors.15 In a later series of patients with residual or recurrent anaplastic oligodendrogliomas
who were treated with a dose-intense regimen of
procarbazine, lomustine, and vincristine, the investigators found a 75 percent response rate to chemotherapy using rigorous imaging criteria.16 As
Dr. Louis has described, the emergence of molecular diagnostic techniques has allowed the identification of patterns of chromosomal alterations in
anaplastic oligodendrogliomas that correlate with
chemosensitivity and prolonged survival.5-7 Thus,
we can now predict which patients with a particular
subgroup of malignant glioma are likely to respond
well to chemotherapy on the basis of chromosomal analysis of the tumor tissue. This observation
raises the question whether chemotherapy alone
may be used in the initial treatment of patients with
chemosensitive tumors; in addition, the usefulness
of other chemotherapeutic regimens in this disease
and the implications of these findings for the management of other types of glial tumors remain to be
explored.
This patient was treated with procarbazine, lomustine, and vincristine chemotherapy for a total
of nine cycles over the course of the following year.
He had no significant adverse side effects from the
chemotherapy, but he was admitted to the hospital 10 months after beginning the chemotherapy
with a pulmonary embolus. During the initial preoperative evaluation at the time of his presentation
with the brain tumor, he was found to have the factor V Leiden mutation, which predisposes a patient
to thrombotic events. He has been maintained on
warfarin since the discovery of the pulmonary embolus and has had no further problems. After the
completion of his chemotherapy, he had no neurologic abnormalities on examination, but he did have
some impairment of short-term memory. He was
referred to Dr. Loeffler for radiation therapy.
Dr. Hunter: Further imaging was performed after surgery (Fig. 1C) and again seven months later
while the patient was receiving the chemotherapy regimen (Fig. 1D). On the final study, there remains some dorsolateral infiltrative signal, but the

n engl j med 351;18

initial high-grade component is no longer present.
The residual area of T2 hyperintensity did not enhance with gadolinium contrast medium and did
not have characteristics of malignancy on images
obtained with magnetic resonance spectroscopy.
Dr. Jay S. Loeffler: The role of radiation therapy in
the postoperative management of an anaplastic oligodendroglioma in a patient such as this is undergoing reevaluation. In the past, patients with this
type of tumor were treated in a very similar fashion
to patients with anaplastic astrocytoma, with surgery and radiation being the predominant forms of
therapy. The recently identified sensitivity to chemotherapy of anaplastic oligodendrogliomas with
allelic loss of chromosome 1p has led some investigators to consider chemotherapy to be the primary
postoperative method, with radiation reserved for
patients with tumor progression.
Does the allelic loss of 1p predict the response
to radiation therapy, as it appears to predict the response to chemotherapy? Bauman et al.17 reviewed
progression-free survival in 36 patients treated with
radiation and whose 1p status was known. The
median progression-free survival for the 19 patients
with 1p loss was 49.8 months, as compared with
5.7 months for those retaining 1p. However, since
many of the patients had received procarbazine, lomustine, and vincristine chemotherapy before radiation therapy was initiated, it is not clear if the
difference in progression-free survival could be
completely explained by differences in the response
to radiation therapy alone. Several clinical protocols are under way to delineate better the role and
sequencing of radiation therapy and chemotherapy for patients with anaplastic oligodendroglioma. This patient was treated with conformal external-beam therapy at the completion of his regimen
of procarbazine, lomustine, and vincristine. CT and
MRI image correlation with image fusion was performed as part of his treatment planning.18 Radiation therapy consisted of 59.4 Gy delivered in 33
fractions to the area of the abnormalities revealed
by the T2-weighted MRI scan, plus a margin. The
patient tolerated the treatment without significant
difficulty. Given the relatively modest treatment volume and the location of the tumor, the probability
of clinically significant late neurocognitive or neuroendocrine effects is anticipated to be low.
A Physician: Do you believe that the development
of venous thrombosis and sleep apnea in the patient were related to his brain tumor?
Dr. O’Neill: I do not believe that the sleep apnea

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case records of the massachusetts general hospital

was related to his brain tumor, but there is a markedly elevated risk of deep venous thrombosis in patients with brain tumors, in addition to the risk associated with the factor V Leiden mutation.
Dr. Tracy Batchelor (Neuro-oncology): Now that
it is four months after the completion of radiation
therapy and almost two years after his initial seizure, the patient has no evidence of recurrence of
his tumor, and he hopes to be able to return to work
soon. He is socially and physically active, and in

fact, his greatest concern is that because of the necessity for long-term anticoagulant medication,
he is unable to participate in physical activities that
he enjoys, such as mountain biking and aggressive
skiing.

anatomical diagnosis
Anaplastic oligodendroglioma with allelic loss of
chromosomes 1p and 19q.

refer enc es
1. Dehghani F, Schachenmayr W, Laun A,

7. Smith JS, Perry A, Borell TJ, et al. Alter-

13. Burger PC, Pearl DK, Aldape K, et al.

Korf HW. Prognostic implication of histopathological, immunohistochemical and
clinical features of oligodendrogliomas:
a study of 89 cases. Acta Neuropathol (Berl)
1998;95:493-504.
2. Shaw EG, Scheithauer BW, O'Fallon JR,
Tazelaar HD, Davis DH. Oligodendrogliomas: the Mayo Clinic experience. J Neurosurg 1992;76:428-34.
3. Schiffer D, Dutto A, Cavalla P, et al. Prognostic factors in oligodendroglioma. Can
J Neurol Sci 1997;24:313-9.
4. Winger MJ, Macdonald DR, Cairncross
JG. Supratentorial anaplastic gliomas in
adults: the prognostic importance of extent
of resection and prior low-grade glioma.
J Neurosurg 1989;71:487-93.
5. Cairncross JG, Ueki K, Zlatescu MC, et
al. Specific genetic predictors of chemotherapeutic response and survival in patients
with anaplastic oligodendrogliomas. J Natl
Cancer Inst 1998;90:1473-9.
6. Ino Y, Betensky RA, Zlatescu MC, et al.
Molecular subtypes of anaplastic oligodendroglioma: implications for patient management at diagnosis. Clin Cancer Res 2001;7:
839-45.

ations of chromosome arms 1p and 19q as
predictors of survival in oligodendrogliomas, astrocytomas, and mixed oligoastrocytomas. J Clin Oncol 2000;18:636-45.
8. von Deimling A, von Ammon K, Schoenfeld D, Wiestler OD, Seizinger BR, Louis DN.
Subsets of glioblastoma multiforme defined
by molecular genetic analysis. Brain Pathol
1993;3:19-26.
9. Watanabe K, Tachibana O, Sata K,
Yonekawa Y, Kleihues P, Ohgaki H. Overexpression of the EGF receptor and p53 mutations are mutually exclusive in the evolution of primary and secondary glioblastomas.
Brain Pathol 1996;6:217-23.
10. Reifenberger J, Ring GU, Gies U, et al.
Analysis of p53 mutation and epidermal
growth factor receptor amplification in recurrent gliomas with malignant progression.
J Neuropathol Exp Neurol 1996;55:822-31.
11. Meyer-Puttlitz B, Hayashi Y, Waha A, et
al. Molecular genetic analysis of giant cell
glioblastomas. Am J Pathol 1997;151:853-7.
12. Tortosa A, Ino Y, Odell N, et al. Molecular genetics of radiographically defined de
novo glioblastoma multiforme. Neuropathol
Appl Neurobiol 2000;26:544-52.

Small cell architecture — a histological
equivalent of EGFR amplification in glioblastoma multiforme? J Neuropathol Exp
Neurol 2001;60:1099-104.
14. Simmons ML, Lamborn KR, Takahashi
M, et al. Analysis of complex relationships between age, p53, epidermal growth
factor receptor, and survival in glioblastoma
patients. Cancer Res 2001;61:1122-8.
15. Cairncross JG, Macdonald DR. Successful chemotherapy for recurrent malignant
oligodendroglioma. Ann Neurol 1988;23:
360-4.
16. Cairncross G, Macdonald D, Ludwin S,
et al. Chemotherapy for anaplastic oligodendroglioma. J Clin Oncol 1994;12:2013-21.
17. Bauman GS, Ino Y, Ueki K, et al. Allelic
loss of chromosome 1p and radiotherapy
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18. Kooy HM, van Herk M, Barnes PD, et al.
Image fusion for stereotactic radiotherapy
and radiosurgery treatment planning. Int
J Radiat Oncol Biol Phys 1994;28:1229-34.
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