Hemorrhoids are classified into two general categories: internal and external. Internal hemorrhoids lie far enough inside the rectum that you can't see or feel them. They don't usually hurt because there are few pain-sensing nerves in the rectum. Bleeding may be the only sign that they are there. Sometimes internal hemorrhoids prolapse, or enlarge and protrude outside the anal sphincter.
Cerebrospinal fluid (CSF) collection is a test to look at the fluid that surrounds the brain and spinal cord. CSF acts as a cushion, protecting the brain and spine from injury. The fluid is normally clear. The test is also used to measure pressure in the spinal fluid. See also: CSF culture.
The term hydrocephalus comes from the Greek words âhydro,â which means water, and âcephalus,â meaning head. Simply put, hydrocephalus is excessive accumulation of fluid in the brain. While once known as âwater on the brain,â the âwaterâ is actually cerebrospinal fluid (CFS). The excessive accumulation of cerebrospinal fluid (CSF) results in an abnormal widening of spaces in the brain called ventricles.