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1. Colloid follicles

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Figure 32-1

Colloid follicles.

A longitudinal sonographic image shows multiple small hypoechoic cysts in an otherwise normal-appearing thyroid. The central echogenic foci represent inspissated colloid.

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2. Athyrosis

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Figure 32-2

Athyrosis.

A, B. There is no discernible thyroid activity on these anterior (A) and lateral (B) 99mTc-pertechnetate scintigraphic images of the neck. There is normal radiopharmaceutical uptake in the salivary glands. (The focus of activity adjacent to the chin is an extrinsic marker.)

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3. Ectopic thyroid

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Figure 32-3

Ectopic thyroid.

A, B. Anterior (A) and right lateral (B) 99mTc-pertechnetate scintigraphic images of the neck and face show lingual and sublingual foci of intense uptake. Both foci of ectopic thyroid tissue are at the midline. There is no uptake at the base of the neck at the normal location of the thyroid gland.

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4. Lingual thyroid

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Figure 32-4

Lingual thyroid.

99mTc-pertechnetate scintigraphy of a mildly hypothyroid 6-month-old demonstrates a focus of intense uptake at the base of the tongue. There is no visible thyroid tissue elsewhere in the neck.

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5. Ectopic thyroid

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Figure 32-5

Ectopic thyroid.

Contrast-enhanced CT of a child with a palpable anterior midline neck mass shows ectopic thyroid tissue anterior to the trachea. The lesion is homogeneous, has well-defined margins, and enhances intensely.

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6. Lingual thyroid

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Figure 32-6

Lingual thyroid.

An oval soft tissue mass (arrows) is visible at the base of the tongue on this lateral radiograph.

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7. Thyroid hemiagenesis

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Figure 32-7

Thyroid hemiagenesis.

There is no uptake in the right lobe of the thyroid gland on this anterior 99mTc-pertechnetate scintigraphic image of the neck.

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8. Thyroid hemiagenesis

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Figure 32-8

Thyroid hemiagenesis.

There is no thyroid tissue to the right of the isthmus on this transverse sonographic image.

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9. Dyshormonogenesis

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Figure 32-9

Dyshormonogenesis.

123I scintigraphy of a 1-month-old infant with hypothyroidism (anterior image of the neck and upper chest) demonstrates intense radiopharmaceutical uptake in an enlarged thyroid gland.

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