Thyroid radio Flashcards

1
Q

Technetium-99m has an uptake mechanism similar to _______

A

Iodine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What type of image do we get in scintigraphy ?

A

2D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the techniques used in thyroid ?

A

US

Scintigraphy

CT/MRI - useful only in some px

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what do we assess with US on thyroid ?

A

Evaluation of the :

** number of lesions

** Sites

** Calcifications

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

vascular evaluation of thyroid can be done with ?

A

color doppler

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What radioisotope is indicated for diagnosis of Grave’s disease ?

A

Tc 99m-Pertechnetate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

plummers diseases appears as

A

solitary hot nodule

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is the distribution seen with Tc 99m pertechnetate with graves disease ?

A

Homogenous distribution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what is the distribution seen with Tc 99m pertechnetate with multinodular goiter disease ?

A

Inhomogeneous distribution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what is the distribution seen with Tc 99m pertechnetate with subacute thyroiditis ?

A

Markedly reduced uptake

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what tracer is used for scintigraphy ?

A

Iodine 131- gamma emitter, has diagnostic use

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

I-131​ is selectively taken up by what cells ?

A

Thyroid follicular cells with the help of sodium-iodine symporters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what type of emitter is Iodine-131 ?

A

both Beta and Gamma

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is the main thing we check for with scintigraphy of the thyroid ?

A

How the nodules appear.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the first line indication test for most patients with UNCERTAIN etiology of Thyrotoxicosis ?

A

Thyroid Scintigraphy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

why Iodine-131 is preferred for therapy ?

A

Longer half-life

17
Q

What Radiotherapy used for benign and malignant thyroid disease ?

A

Iodine 131

18
Q

What is the use of Doppler in thyroid nodule imaging ?

A

For vascularization (combined with US)

19
Q

what does increased vascularization means on doppler when checking thyroid nodule ?

A

Usually indicate malignancy

20
Q

1st level instrument for thyroid diagnosis ?

A

US

21
Q

what is the 2nd level study for the thyroid ?

A

Scintigraphy

22
Q

what is the procedure we perform in case we want to study one of the nodules we find ?

A

Fine needle aspiration, but it is not diagnostic for Pappilary K.

23
Q

what is the frequency of the thyroid US ?

A

linear high frequency 7.5 Mhz

24
Q

how will appear benign nodular lesion on color Doppler ?

A

Hyper-echogenic signal

Regular nodule margin

25
Q

how will appear Malignant nodular thyroid lesion on color Doppler ?

A

Hypo-echogenic signal

Faded margins

26
Q

what other radionuclides can we use for Thyroid except Tc-99 ?

A

Tetro-fosmin

Sestamibi

27
Q

what does thyroid scintigraphy allows us to highlight ?

A
  1. hyper/hypo functioning of the nodule
  2. Ectopic thyroid tissue
  3. Metastasis
28
Q

hot nodule on thyroid scintigraphy is probably

A

benign

29
Q

Cold nodule on scintigraphy is probably

A

Neoplasia

30
Q

what are the most common places of metastasis for thyroid cancer ?

A

Pelvis and chest

31
Q

In what cases do we use PET-CT for thyroid K ?

A

When it’s poorly differentiated and with high levels of Thyroglobulin

32
Q

except FDG, what else can we use for PET in thyroid ?

A

Iodine-124

33
Q

Papillary thyroid carcinoma metastasizes by ;

A

Lymphatic route

34
Q

Follicular thyroid cancer metastasizes to ;

A

Blood, lung, and bone.