Pediatric Tumors

Question 1

peds cns germ cell xrt

Answer 1

RADIOSENSITIVE

Question 2

peds medulloblastoma xrt done when

Answer 2

post-op csi

Question 3

peds medulloblastoma lat ports csi ant/sup/post border

Answer 3

sup/ant/post= flash

Question 4

peds medulloblastoma spine ports csi sup border

Answer 4

sup= inf border of wb

Question 5

wilm’s xrt low dose

Answer 5

10Gy

Question 6

peds sts xrt post op dose

Answer 6

36-50.4 Gy

Question 7

peds low grade astrocytoma xrt dose

Answer 7

50-54 Gy @ 180/fx

Question 8

peds high grade astrocytoma xrt tx margins

Answer 8

2.5 cm margin (2-3 cm)

Question 9

peds optic glioma rad tx fields

Answer 9

• large tailored fld

- 1.5 cm margin

Question 10

peds ependymoma tx if csf seeding

Answer 10

csi

Question 11

peds ependymoma csi dose

Answer 11

54-59.4 Gy

Question 12

peds cns germ cell xrt tx

Answer 12

low dose csi

• boost to 50 Gy
• non-csi= 30-45 Gy to primary mass & supratent vent

Question 13

peds brain stem glioma xrt margins

Answer 13

1.5 cm margin

Question 14

peds brain stem glioma xrt ant border

Answer 14

ant clinoid (avoid optic chiasm ant to sella turcica)

Question 15

peds brain stem glioma sup border

Answer 15

midbrain

Question 16

peds brain stem glioma post border

Answer 16

mid-cerebellum

Question 17

peds brain stem glioma inf border

Answer 17

bottom C1

Question 18

peds medulloblastoma lat tx field OAR

Answer 18

• shield ant globe
• oropharynx
• neck

Question 19

peds medulloblastoma xrt divergence determines ?

Answer 19

coll angle

Question 20

peds medulloblastoma xrt csi spine length

Answer 20

spine to 2nd/3rd sacral

Question 21

peds medulloblastoma xrt csi gap done how often

Answer 21

may be moved/feathered every 10Gy

Question 22

peds medulloblastoma xrt csi dose per day/photon E

Answer 22

1.5-1.8 Gy @ 4-6 MV

Question 23

peds medulloblastoma xrt csi boost what area to ? dose

Answer 23

boost post fossa to 55.8 Gy

Question 24

peds medulloblastoma xrt chemo

Answer 24

chemo before & after

Question 25

peds medulloblastoma xrt wb inf border

Answer 25

cribriform plate & temp fossa

Question 26

peds medulloblastoma xrt wb post border

Answer 26

C2 post

Question 27

peds medulloblastoma wb dose

Answer 27

40 Gy boosted to 50 Gy

Question 28

peds medulloblastoma wb boost area

Answer 28

C2 is boost

Question 29

peds medulloblastoma spine ports inf border

Answer 29

below S2

Question 30

peds medulloblastoma spine ports lat borders

Answer 30

entire vert body + 1 cm margin

Question 31

peds medulloblastoma spine ports dose

Answer 31

36 Gy

Question 32

peds retinoblastoma small tumor xrt dose

Answer 32

1.8-2 Gy to 40-50 Gy

Question 33

peds retinoblastoma small tumor isotopes used for implant

Answer 33

I-125 or Co-60

Question 34

peds neuroblastoma tx xrt stage 3 & 4 dose

Answer 34

21 Gy

Question 35

peds neuroblastoma tx xrt palliation dose

Answer 35

10 Gy

Question 36

peds neuroblastoma xrt shield ? oar

Answer 36

• kidneys

- liver

Question 37

peds neuroblastoma xrt side effect

Answer 37

lung fibrosis

Question 38

wilm’s xrt if spillage

Answer 38

radiation to whole abd

Question 39

wilm’s xrt if unilateral disease

Answer 39

cover whole width of vert body + 1 cm contralateral to avoid scoliosis

Question 40

wilm’s xrt kidney tolerance

Answer 40

15Gy

Question 41

peds sts field margins- necessary to have

Answer 41

spare strip

Question 42

peds sts must include in field?

Answer 42

entire scar