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Brain Tumors

9

 

Paul Imbach

 

Contents

9.1

Overview

.....................................................................................................................

90

9.2

Incidence

.....................................................................................................................

90

9.3

Tumor Types and Frequencies .....................................................................................

90

9.4

Etiology and Pathogenesis ...........................................................................................

90

9.5

Pathology and Classification........................................................................................

91

9.6

Clinical Manifestations ................................................................................................

92

 

9.6.1

Hydrocephalus and Manifestations of High Intracranial Pressure ..............

92

 

9.6.2

Focal Neurological Failures.........................................................................

93

 

9.6.3

Tumor Types and Symptoms According to Intracranial Location...............

93

9.7

Radiological Diagnosis ................................................................................................

97

9.7.1Magnetic Resonance Imaging (MRI) and Computed

 

 

Tomography (CT) ........................................................................................

97

 

9.7.2

Positron Emission Tomography (PET) ........................................................

98

 

9.7.3

Conventional Radiography of the Skull.......................................................

98

 

9.7.4

Special Methods for Special Indications .....................................................

98

9.8

Additional Diagnostic Tools ........................................................................................

98

 

9.8.1

Cerebral Fluid Analysis ...............................................................................

98

 

9.8.2

Electroencephalography...............................................................................

99

 

9.8.3

Stereotactic Biopsy ......................................................................................

99

9.9

Differential Diagnosis ..................................................................................................

99

9.10

Metastatic Spread.........................................................................................................

99

9.11

Therapy

.....................................................................................................................

100

 

9.11.1

Neurosurgical Procedure..............................................................................

100

 

9.11.2

Radiotherapy................................................................................................

100

 

9.11.3

Chemotherapy (for Details of Special Tumor Types See Below)................

101

9.12

Special Tumor Types....................................................................................................

101

 

9.12.1

Astrocytic Tumors........................................................................................

101

 

9.12.2

Optic–Hypothalamic Glioma.......................................................................

103

 

9.12.3

Brain Stem Tumors ......................................................................................

104

 

9.12.4

Medulloblastoma and PNET........................................................................

105

 

9.12.5

Atypical Teratoid Rhabdoid Tumors (ATRT) ..............................................

107

 

9.12.6

Pineal Tumors ..............................................................................................

107

 

9.12.7

Ependymoma ...............................................................................................

108

 

9.12.8

Craniopharyngioma .....................................................................................

110

P. Imbach et al. (eds.), Pediatric Oncology,

89

DOI 10.1007/978-3-642-20359-6_9, © Springer-Verlag Berlin Heidelberg 2011

 

90

 

P. Imbach

 

 

 

9.12.9

Meningioma .................................................................................................

111

9.12.10

Intramedullary Spinal Cord Tumors ............................................................

111

9.13 Adverse Late Effects from Brain Tumors and Their Treatment ..................................

112

9.1 Overview

• Largest group of solid tumors of childhood

• Prognosis depends on location, histology, stage, operability, or adjuvant chemoand radiotherapy

• High rate of morbidity and long-term sequelae

9.2 Incidence

•Nineteen percent of all neoplasia in childhood

•Annually 26 in one million children below the age of 16 years are newly diagnosed

•Slightly higher frequency in boys (especially for medulloblastoma and germinoma). Ratio of boys to girls, 1.25:1

9.3Tumor Types and Frequencies

Tumor type

Mean frequency (%)

Low and high-grade gliomas

 

•

Astrocytoma

40

•

Brain stem tumor

10–25

•

Optic–hypothalamic glioma

4

Ependymoma

6–9

Medulloblastoma

15

Atypical teratoid rhabdoid tumor

Rare

Pineal tumor

2

Craniopharyngioma

7

Othersa

15

aMeningioma, oligodendroglioma, primitive neuroectodermal tumor, sarcoma

9.4Etiology and Pathogenesis

•Deletion of chromosome 17 or 20 with loss of GTPase activity, especially in medulloblastoma

•Relationship to other hereditary disorders (see next table)

9 Brain Tumors

91

 

Relationship between hereditary disorders and brain tumors

Syndromes

Tumor type

Neurofibromatosis 1

Neurofibroma, optic glioma, astrocytoma

Neurofibromatosis 2

Schwannoma, meningioma, ependymoma

Tuberous sclerosis

Astrocytoma (subependymal)

von Hippel–Lindau syndrome

Hemangioma

Li–Fraumeni syndrome

Astrocytoma, medulloblastoma, primitive neuroectodermal

 

tumor (PNET)

•Some familial and sibling occurrence of brain tumors have been described

•High incidence of chromosomal aberrations, with development of neoplasia after previous prophylactic or therapeutic radiation in the brain and skull area (i.e., in survivors with leukemia)

•Genetic factors

9.5Pathology and Classification

•Classifications are based on histogenesis and predominance of cell type

•Degree of malignancy is defined by grading system, i.e., WHO grade I–IV, which is based on the cellular morphology, the rate of mitotic figures, the degree of anaplasia, and the frequency of necrosis

•Other classifications include immunohistochemical and molecular biological analysis

•Immunohistochemistry: monoclonal antibodies against cytoskeletal and membrane proteins, hormonal polypeptides, and neurotransmitters. Examples: vimentin, neurofilamentous protein (NFP), gliofibrillary protein (GFAP), desmin

•Immunohistochemical and molecular biological markers provide subtypes of tumor according to stage of development and differentiation

Types of brain and spinal cord tumors

Degree of malignancy

1. Neuroepithelial origin of cells

 

Glial cells:

 

•

Astrocytoma

Grade I

•

Astrocytoma

Grade II and III

•

Oligodendroglioma

Grade I

•

Oligodendroglioblastoma

Grade II–IV

•

Ependymoblastoma

Grade III + IV

•Choroid plexus carcinoma or poorly differentiated anaplastic – ependymoma

Nerve cells:

•Medulloblastoma: anaplastic subtype with poor prognosis

•Neuroblastoma

2. Pineal tumors

•Pinealoma

•Pinealoblastoma

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