What is an arachnoid cyst? Arachnoid cysts are the most common type of brain cyst. They are often congenital, or present at birth (primary arachnoid cysts). Head injury or trauma can also result in a ...
An ovarian cyst is a solid or fluid-filled sac on the surface of or within an ovary. Small ovarian cysts are unlikely to cause pain. Large ovarian cysts or those that rupture can cause pain that ...