Water on the brain. Coloured computed tomography (CT) scans of the brain showing hydrocephalus, or water on the brain. Clockwise from top right, the scans show axial, coronal and sagittal sections. Hydrocephalus is a condition in which there is an accumulation of cerebrospinal fluid (CSF), the liquid that surrounds and cushions the brain and spinal cord. This is seen by the enlarged ventricles (brown) in the brain, whose lining produces CSF. The CSF normally drains into the blood, but a narrowing or blockage of one of the ducts through which it flows can raise the pressure in the head. At upper left is a 3-D CT scan of the Sylvian aqueduct, which links the third and fourth brain ventricles. Treatment is with drainage of excess fluid.
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