A case of partial oculomotor palsy

Examination of conjugate extraocular movements showing right adduction palsy and right partial ptosis

(A) Brain MRI shows hyperintense signal in the dorsal midbrain on the right side on axial T2-weighted image and (B) schematic representation of the oculomotor nerve fascicles in the midbrain with the arrangement of various fibers in the oculomotor nerve fascicle: IO = inferior oblique; IR = inferior rectus; LPS = levator palpebrae superioris; MR = medial rectus; PF = pupillary fibers; SR = superior rectus. (C, D) Diffusion-weighted imaging (coronal) with reduced apparent diffusion coefficient on the corresponding site.

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