Neurosonology Practice Exam

High-risk findings on thyroid ultrasound are features that raise concern for malignancy: a nodule that is markedly hypoechoic compared with the surrounding thyroid tissue, the presence of microcalcifications, an incomplete or irregular halo, and suspicious cervical lymph nodes. Hypoechogenicity means the lesion appears darker than the adjacent thyroid tissue, which often reflects solid, potentially malignant tissue. Microcalcifications are tiny bright specks within the nodule that are highly associated with papillary thyroid carcinoma. An incomplete halo suggests the lesion isn’t fully encapsulated and may invade surrounding tissue, another warning sign. Suspicious cervical lymph nodes—enlarged and with abnormal characteristics like irregular margins or loss of the fatty hilum—point toward possible metastatic spread. In comparison, the other patterns align more with benign nodules: hyperechoic or isochoic nodules without suspicious features, a complete halo, absence of microcalcifications, and normal lymph nodes. Cystic (anechoic) nodules with a complete halo are also typically benign.