Claude's syndrome affects oculomotor nerve, red nucleus and brachium conjunctivum.

[1] Claude's syndrome is caused by midbrain infarction as a result of occlusion of a branch of the posterior cerebral artery.

[2] This lesion is usually a unilateral infarction of the red nucleus and cerebellar peduncle, affecting several structures in the midbrain including: It is very similar to Benedikt's syndrome.

It has been reported that posterior cerebral artery stenosis can also precipitate Claude's syndrome.

[3] It carries the name of Henri Charles Jules Claude, a French psychiatrist and neurologist, who described the condition in 1912.