The term Hydrocephalus is derived from the Greek words (Hydro means water and cephalus means head). Hydrocephalus may be congenital or acquired. Congenital Hydrocephalus is present at birth and may be caused by either envoirmental influences during fetal developmental or genetic predisposition. Acquired Hydrocephalus develops at the time of birth or at some point afterwards. This type of Hydrocephalus can affect individuals of all ages and may be caused by injury or disease. Symptoms of Hydrocephalus vary with age, disease progression, and individual difference of tolerance of CSF. For example an infants ability to tolerate CSF's pressure differs from an adults. Infancy, the most obvious indication of Hydrocephalus is often the rapid increase in head circumference or an unusually large head size. Other general symptoms may include vomiting, sleepiness, irritability, down ward deviation of the eyes and seizures.