Question 1

Which of the following is the dose at which radiation necrosis of brain tissue is most likely to occur?

Accepted Answer

A)  6000 cGy 
B)  4500 cGy 
C)  4000 cGy 
D)  2000 cGy 
A)  6000 cGy 
B)  4500 cGy 
C)  4000 cGy 
D)  2000 cGy A

Question 2

From which cells to medulloblastomas arise?

Accepted Answer

A)  Primitive neuroectodermal tumor (PNET) 
B)  Primitive neuroectodermal cells 
C)  Astrocytes 
D)  Lymphocytes 
A)  Primitive neuroectodermal tumor (PNET) 
B)  Primitive neuroectodermal cells 
C)  Astrocytes 
D)  Lymphocytes A

Question 3

What defines the inferior radiation field border for the treatment of the whole brain for palliation?

Accepted Answer

A)  1-cm flash 
B)  Superior orbital ridge 
C)  External auditory meatus 
D)  Both b and c 
A)  1-cm flash 
B)  Superior orbital ridge 
C)  External auditory meatus 
D)  Both b and c D

Question 4

Which of the following factors can limit the usefulness of surgery for CNS neoplasms?

Accepted Answer

A)  Tumor location and extent 
B)  Patient status 
C)  Risk of causing neurologic damage 
D)  All of the above 
A)  Tumor location and extent 
B)  Patient status 
C)  Risk of causing neurologic damage 
D)  All of the above

Question 5

Which tumors spread through the cerebral spinal fluid?

Accepted Answer

A)  Astrocytoma 
B)  Oligodendroglioma 
C)  Medulloblastoma 
D)  Schwannoma 
A)  Astrocytoma 
B)  Oligodendroglioma 
C)  Medulloblastoma 
D)  Schwannoma

Question 6

Which of the following conditions is a contraindication for stereotactic radiosurgery (SRS)?

Accepted Answer

A)  Spherical tumor 
B)  2-cm tumor 
C)  Brain metastases 
D)  Five lesions 
A)  Spherical tumor 
B)  2-cm tumor 
C)  Brain metastases 
D)  Five lesions

Question 7

Which of the following is most significant to the prognosis of brain tumors?

Accepted Answer

A)  Tumor size 
B)  Lymph node involvement 
C)  Metastases 
D)  Grade 
A)  Tumor size 
B)  Lymph node involvement 
C)  Metastases 
D)  Grade

Question 8

What is the current 5-year survival of patients with glioblastoma multiforme (GBM)?

Accepted Answer

A)  35% 
B)  55% 
C)  75% 
D)  95% 
A)  35% 
B)  55% 
C)  75% 
D)  95%

Question 9

Epilation may be permanent when the cranium is treated beyond the threshold dose of ______ cGy.

Accepted Answer

A)  1000 
B)  2000 
C)  3000 
D)  4000 
A)  1000 
B)  2000 
C)  3000 
D)  4000

Question 10

Which of the following cells is responsible for myelin production?

Accepted Answer

A)  Neurons 
B)  Schwann cells 
C)  Astrocytes 
D)  Ependymal cells 
A)  Neurons 
B)  Schwann cells 
C)  Astrocytes 
D)  Ependymal cells

Question 11

What is the 5-year survival rate for all CNS tumors combined?

Accepted Answer

A)  20% 
B)  35% 
C)  50% 
D)  75% 
A)  20% 
B)  35% 
C)  50% 
D)  75%

Question 12

What is the most common CNS tumor in children?

Accepted Answer

A)  Medulloblastoma 
B)  Metastatic lesion 
C)  Astrocytoma 
D)  Craniopharyngioma 
A)  Medulloblastoma 
B)  Metastatic lesion 
C)  Astrocytoma 
D)  Craniopharyngioma

Question 13

Which of the following beam arrangements is most typical for treatment of a malignant primary brain tumor?

Accepted Answer

A)  Parallel opposed whole brain fields 
B)  Small fields with 1 to 3 cm margins 
C)  Oblique fields to include the supraorbital ridge 
D)  Large fields with 5 to 10 cm margins 
A)  Parallel opposed whole brain fields 
B)  Small fields with 1 to 3 cm margins 
C)  Oblique fields to include the supraorbital ridge 
D)  Large fields with 5 to 10 cm margins

Question 14

Which class of chemotherapy drugs has the ability to cross the blood-brain barrier?

Accepted Answer

A)  Antimetabolites 
B)  Plant alkaloids 
C)  Nitrosoureas 
D)  Hormonal agents 
A)  Antimetabolites 
B)  Plant alkaloids 
C)  Nitrosoureas 
D)  Hormonal agents

Question 15

Which portion of the brain is the site of intelligence and judgment?

Accepted Answer

A)  Cerebrum 
B)  Cerebellum 
C)  Brain stem 
D)  Thalamus 
A)  Cerebrum 
B)  Cerebellum 
C)  Brain stem 
D)  Thalamus

Question 16

Chemicals that enhance the lethal effects of radiation are known as ____________.

Accepted Answer

A)  cytotoxins 
B)  corticosteroids 
C)  radioprotectors 
D)  radiosensitizers 
A)  cytotoxins 
B)  corticosteroids 
C)  radioprotectors 
D)  radiosensitizers

Question 17

What is the most common type of brain tumor?

Accepted Answer

A)  GBM 
B)  Astrocytoma 
C)  Meningioma 
D)  Metastatic brain lesions 
A)  GBM 
B)  Astrocytoma 
C)  Meningioma 
D)  Metastatic brain lesions

Question 18

Patients treated to the cranium should be advised to protect their heads from direct sunlight because the sun _____________________________.

Accepted Answer

A)  enhances radiation-induced side effects 
B)  causes lower white cell blood counts 
C)  enhances feelings of nausea 
D)  lowers tolerance to anti-inflammatory medications 
A)  enhances radiation-induced side effects 
B)  causes lower white cell blood counts 
C)  enhances feelings of nausea 
D)  lowers tolerance to anti-inflammatory medications

Question 19

What is the most common source of brain metastases among the following?

Accepted Answer

A)  Colon 
B)  Lung 
C)  Breast 
D)  Melanoma 
A)  Colon 
B)  Lung 
C)  Breast 
D)  Melanoma

Question 20

Which of the following is a late effect of brain irradiation in children?

Accepted Answer

A)  Leukemia 
B)  Decreased IQ 
C)  Gigantism 
D)  Chronic fatigue 
A)  Leukemia 
B)  Decreased IQ 
C)  Gigantism 
D)  Chronic fatigue

Exam 32: Central Nervous System Tumors

Which of the following is the dose at which radiation necrosis of brain tissue is most likely to occur?

From which cells to medulloblastomas arise?

What defines the inferior radiation field border for the treatment of the whole brain for palliation?

Which of the following factors can limit the usefulness of surgery for CNS neoplasms?

Which tumors spread through the cerebral spinal fluid?

Which of the following conditions is a contraindication for stereotactic radiosurgery (SRS)?

Which of the following is most significant to the prognosis of brain tumors?

What is the current 5-year survival of patients with glioblastoma multiforme (GBM)?

Epilation may be permanent when the cranium is treated beyond the threshold dose of ______ cGy.

Which of the following cells is responsible for myelin production?

What is the 5-year survival rate for all CNS tumors combined?

What is the most common CNS tumor in children?

Which of the following beam arrangements is most typical for treatment of a malignant primary brain tumor?

Which class of chemotherapy drugs has the ability to cross the blood-brain barrier?

Which portion of the brain is the site of intelligence and judgment?

Chemicals that enhance the lethal effects of radiation are known as ____________.

What is the most common type of brain tumor?

Patients treated to the cranium should be advised to protect their heads from direct sunlight because the sun _____________________________.

What is the most common source of brain metastases among the following?

Which of the following is a late effect of brain irradiation in children?

Cancer: An Overview

The Ethics and Legal Considerations of Cancer Management

Principles of Pathology

Overview of Radiobiology

Detection and Diagnosis

Medical Imaging

Treatment Delivery Equipment

Treatment Procedures

Infection Control in Radiation Oncology Facilities

Patient Assessment

Pharmacology and Drug Administration

Applied Mathematics Review

Introduction to Radiation Therapy Physics

Aspects of Brachytherapy

Special Procedures

Particle Therapy

Radiation Safety and Protection

Patient Safety in Radiation Oncology

Quality Improvement in Radiation Oncology

Surface and Sectional Anatomy

Simulator Design

Computed Tomography Simulation

Photon Dosimetry Concepts and Calculations

Photon Dose Distributions

Electron Beams in Radiation Therapy

Electronic Charting and Image Management

Bone, Cartilage, and Soft Tissue Sarcomas

Lymphoreticular System Tumors

Endocrine System Tumors

Respiratory System Tumors

Head and Neck Cancers

Digestive System Tumors

Gynecological Tumors

Male Reproductive and Genitourinary Tumors

Breast Cancer

Pediatric Solid Tumors

Skin Cancers and Melanoma

Filters