Choroid plexus papilloma: hydrocephalus and cerebrospinal fluid dynamics.

Dynamics of the cerebrospinal fluid were measured pre- and postoperatively in a patient with a choroid plexus papilloma associated with hydrocephalus. The production rate was 0.35 ml/min, absorption 0.0057 ml/min H2O, and the critical opening pressure 196 mm H2O. Following removal of the tumor, these values were 0.32 ml/min, 0.0053 ml/min/mm H2O, and 105 mm H2O, respectively. It was concluded that no over-production of cerebrospinal fluid was present in this case. The hydrocephalus was due solely to obstruction of the fourth ventricle.