Inclusion Criteria:  All patients with acute cerebral pathology with urgent indication to invasive intracranial pressure monitoring (intraparenchymal and intraventricular) Age greater than or equal to 18 years  Exclusion Criteria:  Patients in whom indication to intraventricular catheter placement is stated for reasons other than the need of ICP monitoring (e.g. CSF drainage) Patients in whom indication to invasive intracranial pressure monitoring is not an urgent request Patients in whom a significative coagulation disorder is a contraindication for procedure