Hydrocephalus is a brain disorder in which an abnormal buildup of cerebrospinal fluid creates significant pressure within the skull. In very young patients, his condition may cause rapid enlargement of the head along with poor feeding, seizures, a fixed downward gaze and poor muscle strength and responsiveness. In slightly older children, the condition may manifest itself in headaches and/or vision problems, instability, lack of muscle coordination, seizures and problems waking up, paying attention and performing in school. Additional problems that may occur in older patients include bladder control issues, memory deficits, an inability to concentrate, slow movements and a shuffling gait. Hydrocephalus is treated with surgical interventions such as the placement of a shunt to help drain the excess fluid, and sometimes via an endoscopic third ventriculostomy procedure.