A. Increased Pressure

1. Obstructive (Tumor, malformation)
2. Absorptive (Abnormal arachnoid villi)
3. Overproduction (Tumor, Tuberculous Meningitis)

B. Intermittent Pressure

1. Often (inappropriately) called "Normal Pressure Hydrocephalus"
2. Communicative Hydrocephalus (outflow tract with ventricles)
3. Presentation: Incontinence, Ataxic Gait, Signs of Dementia

Resources

Cerebral Perfusion Pressure (CPP)