CNS CA Flashcards
1
Q
cns CA location
A
- 80% brain
- 20% spinal cord
2
Q
most common adult brain tumor
A
GBM (50% in adults)
3
Q
cns blood supply
A
- internal carotid arteries
- vertebral arteries
- circle of willis
4
Q
cns xrt of vert body ant/post
A
- most ant portion of vert body
- 8.5 cm from post surface
5
Q
cord compression results from what CA?
A
- lung
- brst
- lymphoma
- prost ca
6
Q
pituitary ca XRT field arrangement
A
usu 3 flds= lats & vertex
7
Q
emtpy sella syndrome results in doses above ? for pituitary CA
A
50Gy +
8
Q
vertex for pituitary field should enter
A
above & behind eyes
9
Q
typical whole brain dose
A
35 Gy (250 x 14)
10
Q
astrocytoma location in children
A
cerebellum
11
Q
astrocytoma dose partial brain
A
- 60 Gy
- 1.8-2/fx
12
Q
astrocytoma typical margin around gtv
A
2-3 cm margin
13
Q
overproduction of ACTH from pituitary tumor is related to ? disease
A
cushing’s disease
14
Q
pituitary XRT option?
A
gamma knife (SRS)
15
Q
pituitary CA XRT field size
A
6x6 fld
