A 16-year-old girl presented with a palpable thyroid nodule which was
found to be functioning autonomously by radioiodine (I-123) scintigrap
hy. After needle biopsy proved nondiagnostic, surgical excision showed
the nodule to be Hurthle cell carcinoma. Functional thyroid nodules a
re rarely malignant, thyroid carcinoma is rare in childhood, and Hurth
le cell carcinoma is a rare thyroid neoplasm, so the presence of these
three rare conditions in one patient makes it a very unusual case.