A meningioma is a brain tumor originating in the membranous layers around the brain that, depending on its location, may cause headaches, vision problems, vomiting, seizures, or changes in behavior or personality, according to the National Cancer Institute. Some brain tumors remain asymptomatic a person's entire life and are only later discovered by accident.Continue Reading
Approximately 90 percent of discovered meningiomata are benign, meaning that they are not cancerous and lack the ability to metastasize and spread to other tissues, reports Radiopaedia.org. As a result, many meningiomata are asymptomatic and require no treatment. For those meningiomata that are malignant and symptomatic, they are usually treated with surgical removal or targeted radiation therapy. For meningiomata that are already presenting symptoms, observation without treatment is not recommended.
A malignant meningioma is an especially aggressive tumor, and its removal can be complicated by invasion into other tissues, explains MedScape. In particular, should a meningioma spread into the bone of the skull, complete surgical removal becomes almost impossible. Despite most brain tumors being unable to metastasize to other organs due to the blood brain barrier, a metastasized meningioma (although technically located in the brain), exists on the blood side of the brain blood barrier and often spreads to the lungs.Learn more about Cancer