The case of a female infant with a non-communicating hydrocephalus caused by an enormously dilated straight sinus and the dilated posterior one third of the sagittal sinus is presented. These sinuses drained a torcular dural arteriovenous malformation. Conray ventriculography revealed a complete obstruction of the junction of the aqueduct and fourth ventricle with cephaloventral displacement of the ventricular system by the dilated sinuses. Placement of a ventriculoperitoneal shunt was followed by artificial embolization, by selective catheterization, into the dural feeding arteries.