brain, spinal cord, and nerve disorders
Some Specific Brain Tumors
Pineal Tumors
Tumors can develop near the pineal gland, a small structure deep within the brain. Pineal tumors usually develop during childhood and often cause early puberty, especially in boys. They can block the drainage of cerebrospinal fluid around the brain, leading to hydrocephalus (accumulation of fluid in the brain's ventricles, causing them to enlarge). As a result, pressure on the brain increases. The most common type of pineal tumor is a germ cell tumor. (Germ cell tumors originate in cells that develop into the reproductive system in males and females. These cells are called germ cells.) 