Does anybody know what causes white matter lesions? I was diagnosed with one after having memory issues following being in an induced coma. I have also been diagnosed with cognitive impairment and impairments in 3 other areas(I cant remember which ones). My coma happened after gallbladder removal surgery, my oxygen level dropped to 84 but I felt fine, then the next day I had severe difficulty breathing and collapsed. I was taken to intensive care and intubated. I don't know how long I was not breathing, but when my husband came he was told to prepare for the worst, as it had taken 2 hours to stabilise my just enough to get me to the scan. Hubby was also told that if I did wake up I probably would not know him due to oxygen deprivation. Thankfully I woke up and I did know him. It is only after leaving hospital that I started getting symptoms, memory problems with new information, concentration problems, fatigue etc. lAny ideas if it was the coma or lack of oxygen when I collapsed?