Follicular Variant of Papillary Thyroid Carcinoma
Morphologically,follicular variant of papillary thyroid carcinoma (FVPTC) may appear partially or completely encapsulated and can be misdiagnosed as follicular adenoma or follicular carcinoma pathologically and on (ultrasound) examination. They can be hyper-, iso-, hypoechoic, or mixed with an uneven hypoechoic capsule that is hypervascular with a “spoke-and-wheellike” appearance. Some have sharply marginated areas of different echogenicity within the tumor, a feature we introduce as geographic echo pattern (see page 9). If microcalcifications are found inside the tumor, FVPTC is more likely the diagnosis.These encapsulated FVPTC are often solitary. If they are not encapsulated, they often look like an ordinary PTC both pathologically and on US examination .
KeywordsPapillary Thyroid Carcinoma Follicular Carcinoma Autoimmune Thyroiditis Nodular Goiter Follicular Adenoma
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