GENERAL INTRODUCTION: Clinical Manifestations of CSF Shunt Complications -- Neuroimaging in CSF Shunt Complications. COMPLICATIONS OF EXTRATHECAL CSF SHUNTS: Introduction -- Iatrogenic Complications -- Complications Related to the Choice of the CSF Shunt Device -- Functional Complications -- Mechanical Complications -- Infective Complications -- Complications Related to the Type of Hydrocephalus -- Complications Specific to the Type of CSF Shunt -- Late Complications. COMPLICATIONS OF INTRATHECAL SHUNTS- ENDOSCOPIC TREATMENT: Introduction -- Iatrogenic and Infective -- Complications Due to Insufficient Correction of the Altered CSF Dynamics -- Complications Related to the Type of Hydrocephalus -- Late Failures.