Wallenberg syndrome

Lateral medullary syndrome is a neurological disorder causing a range of symptoms due to ischemia in the lateral part of the medulla oblongata in the brainstem. The ischemia is a result of a blockage most commonly in the vertebral artery or the posterior inferior cerebellar artery. [Source: Wikipedia ]

Lateral medullary syndrome
PICA syndrome
Posterior inferior cerebellar artery syndrome
May Cause
Arterial occlusion
Cranial nerve paresis or paralysis