Oneandahalf syndrome is a clinical disorder characterized by an ipsilateral conjugate horizontal gaze palsy and an ipsilateral internuclear ophthalmoplegia. The main causes of this rare syndrome are stroke and multiple sclerosis. Other causes include tumors, AV malformations, basilar artery aneurysms and rarely, vasculitis, brainstem tuberculoma and neurocysticercosis. Here we present a case of 69 year old male patient who presented to emergency with only blurring of vision and was diagnosed to have acute left sided/ paramedian acute dorsal pontine infarct,one and a half syndrome.

Keywords: One and Half Syndrome; Infarct; Pons.