This animation shows how the csf flows. Most of the csf is produced in the body of the lateral ventricle. Normally, it will flow from the lateral ventricle down through the foramen of monro into the III ventricle. From there it proceeds down the aqueduct into the IV ventricle. There are three openings in the IV ventricle: laterally are the foramen of lushka and medially or in the middle is the foramen of magendie. Place your mouse arrow over the picture on the left and click the left arrow to start the animation.
There is a mass (tumor) at the level of the Foramen of Monroe and the III Ventricle. The CSF (Cerebral Spinal Fluid) flow is obstructed and cannot flow down into the III Ventricle to the aqueduct, into the IV ventricle and then out around the brain and down into the spinal cord. The ventricular system is enlarged proximal to (before) the level of the blockage. Both lateral ventricles, especially the frontal horns are dilated. Place your mouse arrow over the picture on the left and click the left arrow to start the animation.
In this web site you will find examples of Obstructive Hydrocephalus caused by Aqueductal Stenosis, Tumors, Cysts and Hypertensive Hemorrhages. Simply click on the appropriate link on the home page.