s of the thymus (black arrows) attached to the lower pole of the thyroid (white arrow) via the thyrothymic ligament (arrowhead). Note the “starry sky” appearance of the thymus; this is created by hyperechoic fat against the background of the remaining hypoechoic lymphoid tissue. (b) Corresponding anatomic drawing shows the mediastinal (arrowheads) and cervical (arrows) components of the thymus.РAРBР异位胸腺РFigure 2. ponent of the thymus in a 3-year-old boy with a strong maternal family history of papillary thyroid carcinoma. The ponent was misinterpreted as an “exophytic tumor of the thyroid gland.” Contrast-enhanced CT scans show a normal mediastinal thymus (arrows in A) and its ponent (arrows in B). Follow-up studies 2 years later showed no change, and the patient remained asymptomatic.РAРB
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