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Flashcards in Thyroid Nodules Deck (44)
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1

What percentage of women suffer from solitary thyroid nodules?

5%

2

Of the women who suffer from solitary thyroid nodules, what percentage suffer from malignant thyroid nodules?

5%

3

Which types of solitary thyroid nodules are benign?

  1. Thyroid cysts
  2. Colloid nodules
  3. Benign follicular adenoma
  4. Hyperplastic nodules

4

Which types of malignant thyroid nodules are malignant?

  1. Papillary thyroid carcinoma
  2. Follicular thyroid carcinoma
  3. Medullary thyroid carcinoma
  4. Lymphoma
  5. Poorly differentiated

5

What percentage of malignant  solitary thyroid nodules are papillary thyroid carcinomas?

80%

6

Follicular thyroid carcinoma are cancers of which cells?

Parafollicular C cells

7

How are follicular thyroid carcinomas spread?

Haematogenous spread

8

How can it be confirmed that a thyroid nodule is within the thyroid?

If it moves on swallowing it is invested in pretracheal fascia

9

What are 2 essential questions to ask in a history for a solitary thyroid nodule?

  1. Previous neck of irradiation
  2. Family history of thyroid cancer

10

What are two keys things to look for on examination for a solitary thyroid nodule?

  1. Neck nodes
  2. Hoarseness (and bovine cough)

11

Why are neck nodes a major worry if found in the context of a solitary thyroid nodule?

Lymph node spread of a papillary thyroid carcinoma

12

Why is hoarseness and a bovine cough a worry if found on examination in the context of a solitary thyroid nodule?

Recurrent laryngeal nerve palsy may indicate an aggressive thyroid cancer

13

What is a bovine cough?

A wheezing type cough caused due to inability to close the rima glottidis

14

Which three investigations would be undertaken primarily if there is a solitary thyroid nodule?

  1. TSH
  2. USS
  3. FNA

15

Why may a core biopsy be superior to a FNA of a solitary thyroid nodule?

It gives more idea about morphology and structure

16

If TSH is elevated when testing for a solitary thyroid nodule, what may this suggest?

Hypothyroidism

Autoimmune thyroiditis

17

If TSH levels are suppressed when testing a solitary thyroid nodule, what may be the cause an which inestigation would then be a good idea?

Solitary toxic adenoma

Isotope scan

(the tumour does not take up the isotope, but the rest of the gland does)

18

What is the normal range for TSH?

0.4 - 4mU/L

19

What constitutes a low risk patient with a differentiated thyroid cancer?

Age < 50

Tumour < 4cm

20

What is the treatment for a low risk patient with a differentiated thyroid cancer?

Lobectomy

21

What is the treatment for a high risk patient with a differentiated thyroid cancer?

Total thyroidectomy

22

What levels is the central neck?

L6/7

23

What levels is the lateral neck?

L2-L5

24

To which level in the neck do most thyroid cancers spread?

L3/4

(lateral neck dissection required)

25

Why is it recommended to keep TSH levels < 1 mU/L in the presence of a differentiated thyroid carcinoma?

TSH stimulates follicular cells which may worsen the tumour

26

What percentage of malignant thyroid cancers do follicular thyroid cancers comprise?

10%

27

 The diagnosis of a follicular thyroid cancer depends on if it has invaded the capsule or had vascular invasion. What is the tumour called before this stage?

Benign follicular adenoma

28

What is the most common type of follicular thyroid cancer?

Minimally invasive thyroid follicular carcinoma

29

Due to the haematogenous spread of follicular thyroid carcinoma, what are the two most common places for metastases?

  1. Bone
  2. Liver

30

What are the treatment options for minimally invasive thyroid follicular carcinoma?

Thyroid lobectomy

Total thyroidectomy (if significant vascular invasion)