CTICasesThymic cyst with false-positive I-131 accumulation
Imaging findings
CT and MR show a fluid-attenuation, non-enhancing anterior mediastinal mass (thymic cyst). Post-treatment radioactive iodine (I-131) scan showed intense accumulation corresponding to the cyst.
Key takeaways
Thymic cysts can accumulate radioactive iodine (I-131), presenting as a false-positive finding in thyroid cancer staging. Lack of contrast enhancement on CT/MR and stable size over time confirm its benign nature.
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