Unfortunately, I think I can. My GBM is also on my occipital lobe, just had my third surgery--each time "all" of the tumor removed. Last week I began experiencing left hand and foot numbness and tingling, and some perceived weakness of the left hand (hence, my faulty typing). I had an mri shortly after my surgery as part of screening for a clinical trial. The mri showed some enhancement near the tumor cavity, which my docs are currently unsure of because of the closeness of the mri to the surgery. Normally, they said, they would never have performed an mri so soon after surgery because a million things could be going on in there. But I know one of them is regrowth. Another, of course is edema, since I'm off steroids to help with wound healing. They've ordered an mri for Nov. 23. But your sister is further removed from surgery so the issues may be different. Maybe you can try to get the mri moved up a bit and definitely call the doc to let them know about these tremors if you haven't already. They may want to examine her for strength, etc. or review her medications. Goodness I wish you luck. Feeling a little lost myself after more than 2 years of battling this. By the way, I'm 54--so hoping to see 55. NEVER THOUGHT i'D SAY THAT!