A 39 years old woman was admitted to neurological department after acute onset of right haemiparesis, vertigo, and oculomotor paresis. Magnetic resonance (MR) disclosed multiple ischaemic lesions in the brainstem involving pons and mesencephalon, and altered signal in the basilar artery corresponding to partial trombosis. The patient developed coma, was admitted to the ICU, and treated with anticoagulant drugs. Her clinical condition gradually improved: after 1 month she was alert, dysartric, there was bilateral dysmetria of the arms without paresis and a bilateral orizzontal gaze paresis with dissociated nystagmus (one and half …