Case Report First Admission. A previously healthy 17-month-old girl entered the Bronx Municipal Hospital Center on May 4, 1965, because of irritability and unsteadiness of gait of 1 89 weeks' duration. The head circumference was 53 cm. Macewen's sign was elicited. Marked ataxia was present in the trunk and limbs. Spinal fluid pressure was 400 mm. Skull radiographs demonstrated suture diastases. Ventriculography and pneumoencephalography revealed pan-ventricular enlargement with a frontal brain mantle thickness of 3 cm (Fig. 1). A diagnosis of idiopathic communicating hydrocephalus was made. On the 9th hospital day, the patient developed left hemiparesis and right abducens palsy progressing rapidly to coma and decerebrate rigidity with dilatation of the right pupil. Recovery of consciousness with residual hemiparesis and pupil lomotor abnormality occurred on external ventricular drain-
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Rayport et al. (1969) studied this question.