Introduction

Strokes in the territory of the thalamo-subthalamic paramedian artery cause unilateral damage to the thalamo-mesencephalic junction. They are associated with several types of vertical gaze disorders because they interrupt the descending fibres that serve vertical gaze.1 These strokes classically result in the vertical ‘one-and-a-half’ syndrome2 that associates bilaterally upward with ipsilateral downward gaze palsy. The contralesional monocular elevation palsy represents another vertical gaze disorder previously described.3 ,4 We report a case of a thalamo-mesencephalic stroke that resulted in a …