Imaging

Question 1

Why PET/CT is variably useful

Answer 1

Certain tumors are more hot, or avid on PET/CT

Question 2

IF you can’t use contrast use

Answer 2

PET/CT
MRI in some cases

Question 3

What is the utility of bone scans

Answer 3

• Staging of prostate cancer is best use
• For other conditions, they are very nonspecific because they are looking at bone remodeling, which isn’t unique to tumor

Question 4

Tumors that aren’t FDG PET/CTG avid (have low FDG uptake)

Answer 4

low-grade (well differentiated) lung adenocarcinomas
renal cell cancers
mucinous neoplasms

Question 5

GFR cutoff for contrast

Answer 5

30

Question 6

incidence of cancer from imaging

Answer 6

2%!

Question 7

Radiation modality of choice for bone mets

Answer 7

EBRT

Question 8

What is SBRT

Answer 8

Stereotactic body radiation therapy
Utilizes precisely targeted radiation to a tumor while minimizing radiation to adjacent normal tissue.

Question 9

According to RECIST, disease progression is defined as any of the following:

Answer 9

1) 20% or more increase in sum of measurable target lesions compared with the smallest sum previously recorded
2) Appearance of any new lesions
3) Worsening of existing non target lesions (eg bone mets)

Question 10

how do metastastic lung nodules appear?

Answer 10

nicely rounded

Question 11

PET utility and downsides

Answer 11

Useful for FDG avid disease, but otherwise it is essentially a non contrasted CT, so limited study