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Diagnostic ultrasound ( PDFDrive )

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1644 PART V Pediatric Sonography

A

B

C

FIG. 48.26 Ectopic Thyroid. (A) Submental mass in 3-month-old

infant known to be hypothyroid. Ultrasound at site of lump shows

homogeneous soft tissue mass equal in echotexture to normal thyroid.

(B) Color Doppler sonogram of the lesion demonstrates intense vascularity.

(C) Anterior image of technetium 99m ( 99m Tc) pertechnetate scan

conirms lingual thyroid and lack of normal anatomic thyroid tissue.

Differential Diagnosis for Infrahyoid Cystic

Lesions

MIDLINE

Thyroglossal duct cyst

Dermoid or epidermoid

LATERAL

Branchial cyst

Lymphatic malformation (may be midline)

Laryngocele

Thyroglossal duct cyst

Necrotic lymphadenopathy

Teratoma

Thymic cyst

FIG. 48.27 Thyroglossal Duct Cyst. Color Doppler shows a large

anechoic midline cyst immediately anterior to the thyroid gland and

partly encased by the strap muscles.

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