A 10-year-old girl presented with painless masses in the bilateral neck that slowly increased in size over one year. An ultrasound was performed, which revealed an enlarged thyroid gland with multiple cystic nodules in both lobes. An enhanced CT scan showed a total of 4 nodules in both lungs, varying in size from 3 to 11 mm, with marked enhancement in the arterial phase and regression in the delayed phase.
Pathological examination showed lung tissue and well-differentiated thyroid follicular tissue without cellular atypia. Immunohistochemistry staining showed positivity for thyroid transcription factor-1 and paired box gene 8, as well as partial positivity for thyroglobulin, cytokeratin 7, and cytokeratin 19, confirming the diagnosis of the patient.
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