question: I have had 2 meningioma s. The first, a frontopariatal meningioma the size of a lemon removed in 1997. The second, a parasagittal meningioma the size of a quarter removed March 2012. After having trouble with my eyesight, seizures and even just losing my complete sight for short ( seconds to minutes). I requested an MRI. it was found that I have gliosis on my left temporal lobe that has now doubled in size from 1-2 mm to 4mm. I look up gliosis but don t fully understand it and what this can mean for overall neurological well being. is gliosis dangerous? and can it be causing the symptoms I am having?