Hi everyone! I have a question. I had an MRI done which says I have a filling defect in regards to my arachnoid granulations (brain MRI). I am not sure what this means as it wasn't explained to me. I have had a constant pain in the back of my head for over a month and I lose vision when I look certain ways. I am only 22 and am trying to figure out what is wrong with my health. Does anyone know anything about my results?? Any help will be much appreciated. Thanks.