Gastroscopy helps your doctor evaluate various symptoms that include persistent upper abdominal pain, nausea, vomiting or difficulty swallowing. It is an excellent test for finding and treating the cause of bleeding from the upper gastrointestinal tract.astroscopy helps your doctor evaluate various symptoms that include persistent upper abdominal pain, nausea, vomiting or difficulty swallowing. It is an excellent test for finding and treating the cause of bleeding from the upper gastrointestinal tract.
Cerebrospinal fluid (CSF) is a watery fluid that circulates through the brainâs ventricles (cavities or hollow spaces) and around the surface of the brain and spinal cord. A CSF leak is a condition that occurs when the CSF leaks through a defect in the dura or the skull and out through the nose or ear.erebrospinal fluid (CSF) is a watery fluid that circulates through the brainâs ventricles (cavities or hollow spaces) and around the surface of the brain and spinal cord. A CSF leak is a condition that occurs when the CSF leaks through a defect in the dura or the skull and out through the nose or ear.
cerebrospinal fluid the fluid within the subarachnoid space, the central canal of the spinal cord, and the four ventricles of the brain.luid produced within the brain for nutrient transport and structural purposes. CSF circulates through the ventricles, open spaces within the brain, and drains through the membranes surrounding the brain.