Hydrocephalus as a clinical entity is usually defined as the presence of an excess amount of water (CSF, cerebrospinal fluid) resulting in increased pressure inside the head with variable clinico-pathological implications. In this book, the authors discuss the symptoms, treatment and potential complications of hydrocephalus. Topics include the features and management of hydrocephalus; normal-pressure hydrocephalus as a common source of elderly incontinence with brain aetiology; paediatric hydrocephalus; and haemorrhagic hydrocephalus.