Meningiomas are benign tumors that arise from the covering of the brain. As they grow larger, they can compress or distort the brain, the cranial nerves, or other structures. Fortunately, aggressive (invasive or malignant) tumors are uncommon. However, meningiomas can be located near very critical structures making surgery risky and complete resection unsafe.

Some meningiomas may only need close observation- particularly small tumors not causing symptoms. Some may be good candidates for gamma-knife treatment, a very focal form of radiation. In some instances, these non-operative options are chosen due to the patient's age, medical condition, or the tumor location.

Larger tumors and tumors causing symptoms may be cured with surgery. In some cases, the tumor can grow back, usually years after surgery. Fortunately, most meningiomas grow slowly.