My referrals just say "Brain MRI". I think the MRI facility know how to translate this to specific sequences, such as T1 and T2 for axial, coronal and sagittarius. I personally suggest the gadolinium contrast agent for your initial MRI, but I do not have any on subsequent MRIs.
Are there any other signs that suggest an AN? Signs may be unilateral hearing loss, dizziness, altered taste on one side of the tongue. Without a least one other indicator, why test. Also, with ANs there is no rush. You could wait 6 moths and take notes of your symptoms.