Medically reviewed by Robert Burakoff, MD Key Takeaways Liver cysts are usually harmless and don't cause symptoms. Most liver cysts don't need treatment unless they get large and cause issues, like ...

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 ...