Lateral Medullary Syndrome Diagnosis and Characteristics

Clinical Presentation and Vascular Territory

• The vertebrobasilar system, which includes PICA, commonly presents with ataxia, cranial nerve deficits, visual field loss, dizziness, imbalance, and incoordination, according to the American Heart Association 1
• PICA typically arises from the vertebral artery and supplies the lateral medulla and inferior cerebellum, as stated by the American Heart Association 2

Differential Diagnosis and Vascular Territory

• Basilar artery occlusion would produce bilateral findings, altered consciousness, and involvement of multiple posterior circulation territories rather than this focal lateral medullary presentation, as reported in Circulation 1, 2

Lateral Medullary Syndrome: PICA Territory Infarction

Underlying Etiology

• Large-artery atherosclerotic disease in the vertebrobasilar system is the most common cause, particularly affecting the distal vertebral or proximal basilar artery, especially in elderly, hypertensive patients, with the vertebral artery origin or intracranial vertebral artery stenosis being typical culprit lesions, according to the American Heart Association, as published in Circulation 3

Lateral Medullary Syndrome: Vertebral Artery Disease

Clinical Presentation and Vascular Anatomy

• Vertebral artery dissection should be considered as a cause of lateral medullary syndrome, presenting with Horner syndrome, headache, or neck pain, as stated by the American College of Cardiology 4

Risk Factors and Pathophysiology

• No additional facts are available with associated citations.