NCI Dictionary of Cancer Terms
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choroid plexus tumor (KOR-oyd PLEK-sus TOO-mer)
A rare tumor that forms in the choroid plexus (a network of blood vessels and cells in the fluid-filled spaces of the brain). These tumors are most common in children younger than 2 years. Choroid plexus tumors may be benign (not cancer) or malignant (cancer).