Oculomotor nerve palsy

Case contributed by Luu Hanh
Diagnosis almost certain

Presentation

Right ptosis

Patient Data

Age: 75 years
Gender: Female
mri
This study is a stack
Sagittal
T1
This study is a stack
Axial
T2
This study is a stack
Axial
FLAIR
This study is a stack
Axial
DWI
This study is a stack
Axial
MRA
This study is a stack
Axial
CISS
3D
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Info

The white matter T2 hyperintensity is patchy in both cerebral hemispheres suggesting chronic small vessel ischaemia.

The saccular aneurysm arises from the cavernous part of the right internal carotid artery that compresses into the right oculomotor nerve.

There are no abnormal intensity on the midbrain and no neoplasms ( pituitary macroadenomas, meningiomas, schwannomas) along the course of the right oculomotor nerve.

Annotated image
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Yellow arrow: right oculomotor nerve

Pink arrow: aneurysm

Red circle: the close relationship between the right oculomotor nerve and the aneurysm.

Case Discussion

MRI shows the right oculomotor contact with an aneurysm of ICA. The imaging findings in a patient with acute ptosis are in keeping with oculomotor nerve palsy due to a carotid aneurysm.

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