Intraventricular metastases are a very rare finding. A few intracranial tumours and some extracranial tumours metastasize to the ventricles. The most common site of intraventricular metastasis is the trigone of the lateral ventricles due to high vascularity of the choroid plexuses. The next most common sites are the 4th and 3rd ventricles.
- renal cell carcinoma - most common primary
- breast carcinoma
- lung carcinoma - overall most common metastasis in the choroid plexus (as it is the most common tumour)
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