Cerebellar Metastasis From Thyroid Carcinoma With Prominent 123I Uptake But Less Impressive MRI Findings in a Pediatric Patient

Abstract

Papillary thyroid carcinoma in childhood frequently presents with locoregional lymph node metastases. The distant metastases often involve lungs and the bone, whereas brain metastasis is rare. We report a case of classic variant–papillary thyroid carcinoma with right cerebellar metastasis in a 7-year-old girl on a 123I SPECT/CT study. A brain MRI on the same day shows a tiny millimetric enhancing nodule in the right cerebellum with no perceivable perilesional edema, confirming the 123I scan findings.