An arachnoid cyst is a common type of cyst that grows in the brain. You are either born with them (called primary arachnoid cysts) or develop them due to a brain injury, trauma, or infection (referred to as secondary arachnoid cysts). Arachnoid cysts are not tumors and therefore, not indicative of cancer. Arachnoid cysts, just like the cysts that develop on your skin are fluid-filled sacs. In the case of arachnoid cysts, they are filled with cerebrospinal fluid. Arachnoid Cysts and the ... [Read More]