Follicular Adenoma and Follicular Thyroid Carcinoma
A follicular tumor is often solitary. It often has an egg shape, is well marginated, and has a hypoechoic halo all around the tumor [5,6,10]. Most follicular tumors are solid and have homogeneous echogenicity. They can be hyper-, iso-, hypoechoic, or mixed with well-defined areas of different echogenicity within the tumor. Focal cystic components may be present. They usually have a “spoke-and-wheel-like” vascularity with marked circulation in the peripheral halo with vessels converting toward the tumor center. In our experience carcinomas have a tendency to have more rich and less regular flow in the periphery and inside the tumor compared with the flow in the adenomas. A thick and uneven halo is suspicious for malignancy, and if extrathyroidal infiltration is visualized, the carcinoma diagnosis is obvious.
KeywordsPapillary Thyroid Carcinoma Left Lobe Follicular Thyroid Carcinoma Nodular Goiter Follicular Adenoma
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