Pathologically, [3] pineal cysts vary in size from 5 mm to 4.5 cm (usually 1 cm). The cyst wall is usually less than 2 mm thick.

Your brain contains a small pine cone-shaped gland called the pineal gland. It’s about the size of a grain of rice. However, that size can vary in animals depending on their location.

Q. I have a friend who has asked me to search the Internet for information about "penal or penel cysts," located in the brain or head area. I have had no luck. Could you help? -- R.M., Middletown ...