Likely benign: Cystic hypoechoic nodule is usually benign particularly without solid components.However some malignant tumors have cystic components. 0.2mm growth in 11/2 years is slow growth.Most malignant tumors grow faster. Most nodules less than 1 cm are not biopsied. Most small nodules are usually benign. You are correct in getting follow up US exams. Hyperechoic lesions are denser sometimes with calcium.
Answered 12/9/2017
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