A malignant neoplasm involving the choroid plexus. The disease is choroid plexus cancer (MONDO_0002681). Also known as: cancer of choroid plexus, malignant choroid plexus neoplasm, malignant choroid plexus neoplasms, malignant choroid plexus tumor, malignant choroid plexus tumors, malignant choroid plexus tumour, malignant choroid plexus tumours, malignant neoplasm of choroid plexus.