Very few diagnoses cause T2 hyperintensities (white spots) in the spinal cord.
The question is whether it is a one time event, called transverse myelitis or whether it has a chance of happening again somewhere else in the Central Nervous System (CNS), which would generally be called Multiple Sclerosis (MS)
This needs to be evaluated by a neurologist, who actually needs to see the MRIs (there should be Brain, Cervical and Thoracic Spine).