For meningiomas causing symptoms such as headaches, what percentage of patients experience improvement of symptoms after radiation alone?

Without question, patients are often found to have meningioma after presenting with headache. At times the headache may have been due to meningioma, particularly if the meningioma is large meningioma, has broad-based dural involvement, and/or is accompanied by edema, which they often are, especially true with parasagittal primaries. At other times -- and this is anecdotally if not empirically more commonly the case -- the headache and the meningioma seem more likely to be true, true, and unrelated. I appreciate that this explanation will not comfort our patients, and it is clearly our job to both treat expertly and comfort well. So let's look for an answer, realizing that there are weaknesses in the very question.

Several studies have attem...