Medicine & USMLE

Posterior Inferior Cerebellar Artery (PICA)

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Strokes
  1. Anterior Cerebral Artery (ACA)
  2. Middle Cerebral Artery (MCA)
  3. Posterior Cerebral Artery (PCA)
  4. Lenticulostriate Artery
  5. Anterior Inferior Cerebellar Artery (AICA)
  6. Posterior Inferior Cerebellar Artery (PICA)
  7. Anterior Spinal Artery (ASA)
  8. Basilar Artery

Summary

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Key Points

  • Posterior Inferior Cerebellar Artery (PICA)
    • Also known as Lateral Medullary Syndrome or Wallenberg Syndrome
      • Loss of blood supply to lateral medulla
    • Area of lesion
      • Nucleus ambiguus (CN IX, X, XI)
        • Dysphagia, hoarseness, decreased gag reflex, hiccups
      • Vestibular nuclei (CN VIII)
        • Nausea/vomiting, vertigo, nystagmus
      • Spinothalamic tract
        • Decreased pain/temperature sensation from contralateral body
      • Spinal trigeminal nucleus (CN V)
        • Decreased sensation from ipsilateral face
      • Sympathetic fibers
        • Ipsilateral Horner syndrome
      • Inferior cerebellar peduncle
        • Cerebellar signs: Ipsilateral ataxia, dysmetria