Choroid plexus cyst development and growth following ventricular shunting.

Choroid plexus cysts are typically incidental, asymptomatic cysts. They have been reported to hemorrhage and grow, causing symptoms of obstruction. However, growth and multiplication has not been reported following ventriculoperitoneal shunt procedures. A 66-year-old woman initially underwent a suboccipital retrosigmoid craniotomy for resection of a large petroclival meningioma. Preoperatively, the patient had hydrocephalus. After surgery the patient required a ventriculoperitoneal shunt. Two years after the initial shunting procedure, imaging demonstrated significant growth of new bilateral choroid plexus cysts as compared with pre-shunt imaging. Post-shunt imaging also demonstrated evidence of diffuse dural enhancement characteristic of intracranial hypotension. Despite radiographic growth and multiplication of the cysts, the patient was clinically asymptomatic and had a good neurological outcome.