Hi, relax, let the report of MRI suggest something. Some kind of lesions in brain can not be clearly defined with CT hence MRI is done to get to the diagnosis.
As far as cause of seizure is concerned, there can be some space occupying lesion in brain pressing upon brain structures, cyst, granuloma, tumor etc. Most of these problems are treatable without surgery.
Any history of fever, headache, vomiting?