Thyroid Radiology Flashcards Preview

DEMS: Unit III > Thyroid Radiology > Flashcards

Flashcards in Thyroid Radiology Deck (17):
1

Types of imagining used to study thyroid gland

  • US
  • CT
  • MRI
  • PET scan
  • Fxnal imaging

2

Characteristics of US use to study thyroid

  • US: best for detecting and characterizing nodules
  • Can use doppler to tell if node is vascularized
  • Normal appearance → homogeneous
  • Nodule is discrete area within gland that is distinct from normal/surrounding thyroid parenchyma

3

Characteristics of types of nodules seen on US

  • Solid → discrete well-defined nodule
  • Cystic → discrete well-defined fluid filled
  • Complex → discrete nodule with both fluid and solid comp
  • Cancer → punctate very small heterogeneous clarifications

4

Characteristics of CT use in thyroid imaging

  • useful to define extension to lymph nodes and distant metastases
  • Normal → hyperdense and hypervascular, homogeneous

5

Characteristics of MRI use in thyroid imaging

  • Useful for observing tissue invasion from metatasis
  • Useful for infiltrative disease, especially in post surgery where anatomy is distorted
  • Detection of deep nodal disease
    • Can’t differentiate b/w solid vs cystic nodule
  • T2: Thyroid is slightly hyperintense

6

Characteristics of PET scan and functional imaging use in thyroid imaging

  • PET scan: thyroid cancer staging - look for metastatic disease
    • Detects hypermetabolic adenopathy
  • Functional imaging: Iodine scan → evaluate the function of the gland
    • Use radiotracer for diagnostic/therapeutic purposes

7

Dx?

Normal thyroid US

8

Characteristics of thyroid on CT Neck

  • hyperdense
  • hypervascular

9

Dx?

Normal CT

10

Dx?

Solid nodule

11

Dx?

Cystic nodule

12

Dx?

Complex nodule

13

Dx?

Thyroid cancer

14

Dx?

Hashimoto's disease

15

Dx?

  • hot nodule
  • malignancy unlikely

16

Dx?

  • Cold nodule = possibly malignant
  • US + FNAB to determine malignancy

17

Common disease states seen on thyroid imaging

  • Hot large thyroid gland → Graves disease (123I thyroid scan)
  • Cold nodules: solid, cystic, cancer
  • Hot nodules
  • Thyroid Cancer → hypermetabolic adenopathy on CT/PET
    • Therapy: 131I radioactive iodine