Evaluation of Rare Choroid Plexus Metastasis From Papillary Thyroid Carcinoma With Multimodality Imaging

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Papillary thyroid carcinoma (PTC) is the most common malignancy of thyroid gland. Though it metastasizes primarily through lymphatics, hematogenous spread is not infrequent. We report the case of a 62-year-old male patient with intraventricular choroid plexus metastasis from PTC, incidentally detected on post–high-dose radioiodine therapy whole-body 131I scan, which is an extremely rare presentation. Only 3 cases of choroid plexus metastasis from thyroid carcinoma have been reported. Further multimodality radiological investigations confirmed diagnosis and helped in assessing treatment response. The patient received gamma-knife stereotactic radiosurgery, and follow-up radiological imaging suggested improvement of intracranial metastasis.

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