Looks Like A Duck

Question: A 72 year old female is referred for evaluation of a thyroid nodule palpated by her primary care provider. Ultrasound is obtained that demonstrates a 1.8 cm nodule in the right thyroid lobe. Which of the following features is not concerning for malignancy?

a) Irregular margins

b) Partially cystic

c) Microcalcifications

d) All of the above are concerning features for malignancy

[Answer will be posted with next week's new question]

Answer to last week's question, "Coming and Going" (February 25, 2019)

Serum antibody to 68 kDa antigen.