It is the most variable cerebral artery and has a variable territory depending on the size of the AICA. Typically, the PICA may supply:
Common type of cerebellar stroke: headache, vertigo, nystagmus, ipsilateral axial lateropulsion, gait and appendicular ataxia.
More or less complete dorsal lateral medullary syndrome (Wallenberg syndrome) if the medulla is involved: ipsilesional vestibular (vertigo, vomiting, nystagmus, lateropulsion), V, IX and X cranial nerve palsies, Horner syndrome, appendicular ataxia with contralesional loss of pain and temperature sensation. Hiccups are frequent and prolonged.