EXAM #1: IMAGING OF THE THYROID Flashcards Preview

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Flashcards in EXAM #1: IMAGING OF THE THYROID Deck (18):
1

In the normal individual, what happens to the thyorid gland with age?

Gland naturally becomes more nodular

2

Why would you image the thyroid gland?

1) Evaluate abnormality of thyroid function test
2) Morphologic abnormality

3

What is the role of imaging in hypothyroidism?

NONE

4

What test should I order for the hyperthyroid patient?

Nuclear medicine iodine uptake and scan

5

What type of rays are given off from the decay of the radioactive iodide?

Gamma rays

*These are in the same spectrum as x-rays i.e. a gamma camera

6

What determines whether a nuclear scan is normal or not?

Uptake of radioactive iodine

(10-25% uptake is normal)

7

What is the gross appearance of the thyroid in Graves' Disease?

Large, beefy, symmetric, and red

8

What is the classic nuclear scan finding in Graves' Disease?

Elevated uptake

9

What is the nuclear med finding in a toxic adenoma?

- Normal range uptake
- BUT a very strong focus of activity

10

How will a multinodular goiter appear on nuclear scan?

- Heterogenous
- Many areas of focal uptake
- Total uptake can be in the normal range

11

How will the nuclear med scan appear in the setting of thyroiditis?

*LOW uptake--looks like nothing

12

What is the difference between a goiter and a thyroid nodule?

Goiter= prominent thyroid gland

Nodule= single spot that is enlarged

13

In general, it is more high yield to image a diffuse enlargement of the thyroid vs. focal nodule?

Focal nodule

*Goiter/ diffuse enlargement is rarely associated with cancer

14

What are the three etiologies for a distinct thyroid nodule?

1) Cyst
2) Benign adenoma
3) Malignancy

15

What test is best to evaluate morphologic disease of thyroid?

Ultrasound

16

What kind of radiation is associated with US?

NON-ionizing radiation

*Electrons won't be liberated; can't cause DNA damage

17

What is the major limitation of thyroid US?

No way to distinguish between benign and malignant

18

How are nodules evaluated following US?

FNA