What is cryptogenic stroke?
Cryptogenic stroke is a type of stroke wherein the cause of the stroke is unknown. It is estimated that about 30-40% of all strokes are cryptogenic. Risk factors for cryptogenic stroke include advanced age, hyperlipidemia, hypertension, prior stroke or transient ischemic attack, and atrial fibrillation. Diagnosis of cryptogenic stroke typically involves a combination of medical history, physical examination, imaging studies, and laboratory tests.