I just got back from my appointment with my neurosurgeon, Dr Stovall. In his opinion, the tumor (yes, it's officially a tumor now) and the seizures may in fact be related; an EEG, he tells me, is good for identifying seizures, but not for locating them to a high degree of precision. Not only that, he also believes that the growth is a benign (albeit abnormal) meningioma. Extracting it now would carry a 10-to-15% chance of a negative outcome (most likely decreased right-side strength or dexterity or complications arising from compromising the nearby sagittal vein). Therefore, what he recommends, and what I had actually concluded was the best course of action before he suggested it, is to treat the seizures with the Tegretol I'm already starting, to watch the lesion for signs of change, and to monitor me for any further symptoms. To that end, I'm scheduling another MRI for mid-April to see if things have changed.