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.
When this fluid leaks from the brain or spinal cord, it is called a cerebrospinal fluid leak, or CSF leak. When the fluid leaks, the pressure around the brain and spinal cord drops.t the Yale Sinus and Allergy Program, we are specialists in treating cerebrospinal fluid leaks and the symptoms associated with them. Cerebrospinal fluid is a clear, colorless fluid that surrounds the spinal cord and brain.