ACUTE OBSTRUCTIVE HYDROCEPHALUS CAUSED BY A MIGRATING INTRAVENTRICULAR CALCULUS - CASE-REPORT

A 10-year-old boy presented with acute obstructive hydrocephalus cause d by the impaction of a calculus on the cerebral aqueduct. The calculu s migrated from the third ventricle to the fourth ventricle after vent ricular drainage and right ventriculoperitoneal shunt placement had be en performed. The nature and origin of the calculus could not be deter mined, although its release from the choroid plexus in the lateral ven tricle is highly possible.