There can be other therapeutic reasons for ventriculostomy placement. Sometimes CSF pressure within the skull needs to be reduced to allow a CSF leak to heal. Or when intracranial pressures (ICP's) are high for reasons other than hydrocephalus (for example, bleeding or swelling within brain tissue itself), removing CSF can still help reduce ICP's. Also, by measuring ICP's, a ventriculostomy can guide ICP- reducing drug therapy.