Ocular tilt reaction due to an upper brainstem lesion: Paroxysmal skew deviation,torsion, and oscillation of the eyes with head tilt

A patient with a focal brainstem abscess in the region of the zona incerta developed a chronic oculocephalic dyskinesia in which paraoxysmal tonic skew deviation and torsion of the eyes were coupled with ocular oscillations and head tilt.