CRO Exam 1 Questions & Answers 2024/2025
Brain gray matter is central/peripheral and white matter is central/peripheral - ANSWERSperipheral central
Spinal cord white matter is central/peripheral and gray matter is central/peripheral - ANSWERSperipheral central
Where does the spinal cord ...
Brain gray matter is central/peripheral and white matter is central/peripheral - ANSWERSperipheral
central
Spinal cord white matter is central/peripheral and gray matter is central/peripheral - ANSWERSperipheral
central
Where does the spinal cord end in adults? - ANSWERSL1
Where does the spinal cord end in newborns - ANSWERSL3-L4
What is the most common adult primary CNS tumor? - ANSWERSMeningioma 30-35%
What is the 2nd most common adult primary CNS tumor? - ANSWERSGBM 20%
What are the advantages of using IMRT over 3DCRT for CNS tumors? - ANSWERSsparing critical
structures
deliver hot spots in center of tumor
When planning for CNS tumors, what imaging modality is fused with the treatment planning CT and
why? - ANSWERSMRI to delineate target volume
When do the late radiation complications from treating brain and spinal chord neoplasms occur? -
ANSWERS6 months to many years
What is the most common primary malignant CNS tumor in adults? - ANSWERSmalignant gliomas
,What is the most common malignant glioma in the brain? - ANSWERSGBM
What are the two most common presentations of malignant gliomas - ANSWERSheadache seizure
Brainstem gliomas are most common in what type of patients, and when does the incidence peak? -
ANSWERSyoung patients
peaks between 4-6 years
What is the most common benign intracranial tumor in adults? - ANSWERSmeningioma
What is the male:female ratio of meningioma? - ANSWERSF:M = 2:1
Age of incidence for meningioma? - ANSWERS6th & 7th decade
From where do acoustic neuromas arise? - ANSWERSSchwann cells
What two hormones are most commonly secreted from pituitary tumors? - ANSWERSProlactin (30%)
GH (25%)
What is the second most common pediatric CNS tumor? - ANSWERSMedulloblastoma
What percentage of patients have CSF spread at the time of diagnosis of medulloblastoma? -
ANSWERS30-40%
What is CSF? - ANSWERScerebrospinal fluid
When simulating a patient for craniospinal irradiation for medulloblastoma, how is the patient
positioned? (using traditional approach)? - ANSWERSprone extend neck head mask
, How do you calculate the collimator angle of the cranial field to match the divergence of the spine field?
- ANSWERSarctan(.5*length of the superior spinal field/SSD)
When creating a treatment plan using craniospinal irradiation for medulloblastoma, how do you
calculate the couch angle of the spinal field to match the diverging cranial fields? -
ANSWERSarctan(.5*length of cranial field/SAD)
Name two alternate delivery methods for craniospinal irradiation and why would they be employed? -
ANSWERSprotons reduce exit dose
tomotherapy avoid need to match fields
What is Brown-Sequard syndrome and what malignancy is associated with? - ANSWERSipsilateral loss of
motor fine touch sens of pain and temp
primary spinal cord tumors
the CNS includes the ________ and ________ but NOT the peripheral nervous system - ANSWERSbrain
spinal cord
the parenchyma of the brain includes the (3) - ANSWERScerebrum
cerebellum
brainstem
The brain's supporting tissues include - ANSWERSoligodendrocytes
astrocytes
ependymal cells
What percentage of CNS mets to vertebral bodies causes cord compression? - ANSWERS20%
Why is radiation a common treatment for CNS tumors? - ANSWERSSurgery may not be possible
Blood brain barrior prevents chemo
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Bensuda. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £8.56. You're not tied to anything after your purchase.
