The region of the third, fourth and/or sixth cranial nerve nucleus and the respective tract within the brainstem to the root entry zone is abnormal.

The root entry zone within the brainstem of the third, fourth and/or sixth cranial nerve cranial nerves is abnormal.

The sites of the median longitudinal fasciculus and ocular-vestibular pathways in the brainstem are abnormal.

Generalized abnormal meningeal (dural and/or pia-arachnoid) process is present.

The pia/arachnoid surface at the root entry zone of the third, fourth and/or sixth cranial nerve is abnormal.

There is abnormal enhancement and/or enlargement of the cisternal segment of the third, fourth and/or sixth cranial nerve.

There is a structural abnormality along the cisternal segment of the third, fourth and/or sixth cranial nerve.

There is a posterior communicating or other cerebral aneurysm along the cisternal segment of the third, fourth and/or sixth cranial nerve.

There is abnormal meningeal enhancement along the cisternal segment of the third, fourth and/or sixth cranial nerve or the point of entry of these nerves into the cavernous sinus and paracavernous dural envelope.

There is an infiltrating process or structural abnormality in the region of Dorello’s canal.

There is abnormal enhancement and/or enlargement of the 3rd, 4th or 6th cranial nerve in the cavernous sinus or paracavernous region.

There is a structural abnormality along course of the third, fourth and/or sixth cranial nerve within (sixth) and/or adjacent to (third and fourth) the cavernous sinus.

There is a cavernous or clinoid segment aneurysm or carotid-cavernous fistula.

The orbital apex and superior orbital fissure appear abnormal.

One or more extraocular muscles appear abnormal.

The intraconal and/or extraconal orbital fat appears abnormal.

There is a pathologic process arising within the orbit, sinonasal structures or skull base that might produce secondary loss of normal ocular motility or vision by involving extraocular muscles.