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Coronal plane MRI of the right orbit of an adult with progressive acquired right oculomotor palsy showing atrophy of the IR, medial rectus (MR), superior rectus (SR), and levator muscles, along with motor nerves to each. Note the normal caliber of the abducens nerve (n. VI) and bulk of the lateral rectus (LR) muscle for comparison. LPS: levator palpebrae superioris muscle; ON: optic nerve. Image planes are 2-mm thick.
