This is a well-circumscribed hypoechoic area with decreased flow. This can occur as a sequela of infarction or tumor. The sonographer should scan an area of concern and endeavor an abnormality. This is a case of dilated rete testes, a normal variant in older men.
This testicle contains a well-circumscribed hypoechoic, hypovascular area in the upper pole that is hypovascular. Though hypovascular, this could have a similar appearance to a testicular tumor such as a seminoma; this represented testicular infarction to lifting weights.
This is an enlarged and distorted lymph node. This can be associated with metastatic spread of follicular papillary cancer or can be “reactive” due to inflammation.
This is a large papillary thyroid cancer containing numerous vessels. A fine needle aspiration could be performed safely.
There is an ill-defined group of hypervascular nodules in the upper pole. Fine needle aspiration would be indicated for further evaluation.
This sonogram shows a parathyroid mass inferior to the left lobe.
This is a typical thyroglossal duct cyst. They are usually found in the midline and can contain some low-level echoes.
This is a solid nodule that was found to represent a metastatic lesion to the thyroid.
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*Kerry E. Weinberg was the author of the previous-edition version of this chapter.