Vellum Interpositum Cyst

A cyst is a fluid-filled, sac-like structure that can occur almost anywhere in the human body. Cysts are not tumors and are usually benign. However, when cysts are found in certain parts of the brain, their symptoms can be severe and they may require medical treatment.

Identification

• A vellum interpositum cyst is a cerebral cyst that grows in the part of the brain from which it takes its name. A cyst is not a neoplasm (a growth of new cells) and is therefore not considered a tumor, according to the American Association of Neurological Surgeons. Typical cerebral cysts are a buildup of fluid encapsulated in a confining structure.

Symptoms

• As time goes on, the fluid in a cerebral cyst may increase, thus enlarging the overall size of the cyst and subsequently putting pressure on vital structures of the brain or spinal cord. According to the American Brain Tumor Association, this may cause symptoms similar to those caused by a true brain tumor, including headaches, seizures and sensitivity to light.

Treatment

• According to the National Brain Tumor Society, these cysts can be either surgically removed or drained of their contents. A neurological surgeon can decide the best course of action depending on the size of the cyst and the thickness of the encapsulating structure.