Thyroid Ultrasound > Mini-Quiz Answers

Mini-Quiz Answers

1. D. Correct - Describes the appearance of colloid crystals within a colloid cyst.

2. A. Correct – 95% of all endocrine cancers

3. C. Correct - The use of external-beam irradiation in children and young adults in the 1950s and 1960s for acne and tonsillitis has been shown to result in an increased incidence of papillary cancer, usually 15 years after exposure. Irradiation for soft tissue malignancy, such as Hodgkin lymphoma, have an increased incidence of thyroid nodules and cancer.

4. B. Correct – 75-80% of thyroid cancers. Excellent prognosis.

5. D. Correct – An aggressive feature of Anaplastic thyroid carcinomar.

6. C. Correct - Autopsy studies show that 50% of patients with a clinically normal thyroid have nodules. In the Framingham population study, nodules were found by palpation in 6.4% of women and 1.5% of men.

7. A. Correct - Echogenic follicular adenomas are often smoothly marginated and ovoid in appearance, prompting use of the term ‘‘pseudotesticle’’ to describe their appearance.

8. A. Correct - At this point, given the limitations of CT, it is probably prudent to report all thyroid nodules less than 1cm incidentally detected on CT. However, it is not reasonable to advise a follow-up ultrasound examination in every patient, and it should be left up to the clinician who has full access to clinical information and the medical history of these patients.

9. B. Correct – Classic scenario for Hashimoto thyroiditis whicht causes a characteristic sonographic pattern of diffusely coarse echotexture with innumerable tiny hypoechoic nodules that may become confluent, interspersed with echogenic fibrous bands. Vascularity may be increased, decreased, or normal, and FNA is usually not necessary for diagnosis.

10. C. Correct – The chance is 1 in 3 and therefore biopsy should be recommended.

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