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Diagnostic ultrasound ( PDFDrive )

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A

B

C

FIG. 19.18 Papillary Thyroid Carcinoma: Atypical. Three

examples of moderate to marked cystic degeneration of

papillary carcinoma. In our experience, less than 5% of

papillary carcinoma has this appearance of a large amount

of cystic change. More than 90% of papillary thyroid carcinomas

are uniformly solid masses. (A)-(C) Longitudinal

images show three large nodules (arrows, calipers) that

display extensive cystic change.

FIG. 19.19 Papillary Carcinoma Invades Muscle. Longitudinal image shows

hypoechoic mass arising from anterior surface of the thyroid. This mass invades

(arrows) adjacent strap muscle (M). Muscular invasion is very rare.

A

B

FIG. 19.20 Atypical Papillary Thyroid Carcinoma. Longitudinal images show two examples of the follicular variant of papillary thyroid carcinoma.

(A) Oval isoechoic and (B) hypoechoic masses that look similar to the typical ultrasound appearance of a follicular neoplasm. This follicular variant

is uncommon, accounting for 10% of cases of papillary carcinoma. The clinical course and treatment are the same as for typical papillary thyroid

carcinoma.

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