HydrocephalusHydrocephalusAbnormal dilatation of the cerebralventricular systemHydrocephalus should be differentiated fromdisorders producing ventricular enlargementsecondary to cerebral atrophy.Classified into :1. Communicating Hydrocephalus2. Non communicating Hydrocephalus
Characterisics of HydrocephalusCharacterisics of HydrocephalusVentricular enlargement disproportionate tothe degree of sulcal wideningEnlagement of temporal hornePeriventricular fluid 2ry to transependymalCSF permeationEnlarged 3rdventricle with large suprapinealand chiasmatic recesesIn children < 2 years the head circumferenceis often the best distinguishing featurebetween hydrocephalus and atrophy.
Non-Communicating HydrocephalusNon-Communicating Hydrocephalus(Intraventricular obstruction)(Intraventricular obstruction)Ventricular dilatation caused byintraventricular obstruction at or above thethe outlet foramina of the 4thventricleCauses:1. Lateral ventricle2. Foramen of Monro3. 3rdventricle4. Aqueduct of sylvius5. 4thventricle
Lateral Ventriclar causes:Lateral Ventriclar causes:1. Intrinsic tumor: ependymoma2. Ventriculitis: due to intraventricularadhesions3. Extraventricular Tumour: mass effectfrom large parenchymal mass