Imaging of the thyroid gland

Question 1

what are the two main reasons to want to image the thyroid gland?

Answer 1

to assess:

function 
morphology

Question 2

is there a role for imaging in hypothyroidism? what is the correct therapy?

Answer 2

no

hormone replacement

Question 3

what test is ordered for the hyperthyroid patient?

Answer 3

nuclear medicine iodine uptake and scan

Question 4

what is the normal range for thyroid uptake?

Answer 4

10-25%

Question 5

what does an uptake and scan look like in thyroiditis?

Answer 5

blank

Question 6

definition: diffuse goiter

Answer 6

prominent thyroid without focal nodule means thyroid is enlarged

Question 7

why is it not necessary to image a diffuse goiter?

Answer 7

because it almost always presents as a nodule

Question 8

what are the three etiologies of the distinct nodule?

Answer 8

cyst
benign adenoma
malignancy (papillary, follicular)

Question 9

what test is ordered for a distinct nodule / morphologic disease of the thyroid?

Answer 9

ultrasound

Question 10

what are the limitations of US?

Answer 10

• cannot distinguish benign from malignant nodules

- sensitivity and specificity are insufficient

Question 11

the thyroid is imaged for one of which two reasons?

Answer 11

1. hyperthyroidism - nuclear medicine uptake and scan

2. thyroid nodule - ultrasound