An ovarian dermoid cyst is a benign or noncancerous cyst that develops on the ovaries. It is a fluid-filled sac that contains tissues such as teeth, skin, hair, and fat. People may also refer to them ...

A pineal cyst is a benign fluid-filled sac that occurs in the brain’s pineal gland. Although they usually don’t cause symptoms, some people may experience vague symptoms, like a headache. Pineal cysts ...