Choroid plexus cells are involved with ependymal cells in the production of CSF. They are found in the ventricles and are part of the blood-brain barrier.
Like ependymal clumps they are infrequently seen in CSF cytospins. They tend to be observed in clusters, but it is evident that they are individual cells rather than a single multinucleated mass like ependymal clumps.
