ABSTRACT Abnormal focal accumulation of 131I is generally a reliable indicator of differentiated thyroid cancer metastases. However, many examples of false-positive 131I uptake were reported but only a few with… Click to show full abstract
ABSTRACT Abnormal focal accumulation of 131I is generally a reliable indicator of differentiated thyroid cancer metastases. However, many examples of false-positive 131I uptake were reported but only a few with orbital accumulation of radioiodine. We report the case of a 68-year-old woman with differentiated thyroid cancer who underwent thyroid remnants ablation with radioiodine. A focus of considerable 131I uptake corresponding to a small, periorbital tumor was detected on posttherapy whole-body 131I scan and head SPECT/CT. The tumor was surgically removed, and pathology revealed a conjunctival inclusion cyst with no features of thyroid tissue. Orbital 131I uptake was not detected on follow-up scans.
               
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