Choroid plexus isografts in rats

Choroid plexuses from adult rats were grafted to the kidneys of other rats of the same inbred strain. Almost all the grafts survived and exhibited a multiloculated pattern of choroidal papillae. Mild but progressive enlargement of the locules was probably caused by secretion of cerebrospinal fluid. Cyclophosphamide, a drug which damages the normally situated plexus, had similar but milder effects on the plexus implants. Isografts should prove useful for other studies of choroid plexus structure and function.