# Giant metastasis to the choroid plexus of papillary thyroid cancer: case report and review of the literature

## TL;DR

A rare case of papillary thyroid cancer metastasizing to the choroid plexus is reported, with treatment involving surgery and radiotherapy.

## Contribution

This is the 10th reported case of thyroid cancer metastasis to the choroid plexus, highlighting its extreme rarity.

## Key findings

- Metastases to the choroid plexus are rare, comprising only 1% of brain metastasis cases.
- Papillary carcinomas are the most frequent tumors in intraventricular lesions.
- The patient was treated with subtotal resection and adjuvant radiotherapy.

## Abstract

Metastases to the choroid plexus are extremely rare, accounting for only 1% of brain metastasis cases. Among intraventricular tumors, the most frequent are papillary carcinomas, meningiomas, and papilloma, with rare metastatic lesions accounting for only 6% of all intraventricular lesions. We report the case of a patient with a giant metastatic lesion of papillary thyroid cancer with intratumorally hemorrhage in the choroid plexus of the left lateral ventricle, which was treated urgently with subtotal resection of the lesion and subsequent adjuvant treatment with radiotherapy. To date, we report the 10th case of primary choroid plexus metastasis of the thyroid.