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In histological examinations Shuanshoti and Netsky found choroid plexus cysts with multiple tubules lined by simple cuboidal epithelium in the wall.1 The proposed mechanism of formation of tubules and cysts was folding of the epithelium into the stroma to enlarge the surface of the choroid plexus. The epithelium can produce cerebrospinal fluid so that tubules and cysts can grow.
When we examined choroid plexus cysts of the lateral ventricle by means of a high resolution ultrasound system (HDI 5000 and 12–5 MHz-Linear-Broadband-Scanhead from Advanced Technology Laboratories, Washington, USA) we found spherical cysts with a double wall (fig 1).
We propose that the spherical form of the choroid plexus cyst is the result of secretion of cerebrospinal fluid by the epithelium into the cyst. The double wall seems to be the result of multiple tubules in the wall of the cyst which Shuanshoti and Nesky found in histological examinations of choroid plexus cysts in 1966.1