Dear friend, welcome to HCM.
For a good answer we need all the details of your symptoms for which MRI was done.
Could you please post them?
Cortical sulci are the undulations of the brain surface and prominence can be seen in various conditions and may be normal.
You may consult a neurologist
if you had any specific symptoms.
Would be glad to help you in future anytime.
Dr. Prasad Akole