I've been on the breast cancer board for 14 years now my daughter having MRI for Brain

My daughter had a seizure the other night. She is 19 and never had one before. she sat down head hung down eyes open and could not hear me. It only lasted a few minutes but scared me to death. The ER did a CT SCAN and said the results said A 3MM and adjacent 2MM low attenuation midline suprasellar densities. The Hu is minus 32 consistent with fat. Recommend mRI for exclusion of suprasellar lesion.
Can anyone tell me what FAT means and what this all means. MRI is not until tomorrow evening and being a cancer patient and its my girl I am so afraid not to know what it means.