Metastatic tumours in the choroid plexus are generally considered to be very rare. We report a case of bladder carcinoma metastasizing to the choroid plexus of the trigone of the lateral ventricle. This tumour was shown by computed tomography and magnetic resonance imaging of the brain, followed by stereotactic biopsy and histological confirmation. Systemic investigation revealed bladder carcinoma. The differential diagnosis for intraventricular masses should include metastasis.