Sticky platelet syndrome (SPS) is an autosomal dominant platelet disorder, representing a poorly known and studied cause of both arterial and venous thrombotic events. Its pathogenic mechanism is unknown; its presence can be determined with platelet aggregation and adhesion tests. SPS is responsible for 23% of unexplained arterial and 14% of venous thromboses, in which it is impossible to identify a cause. We describe the case of a 35-year-old woman who presented with acute and progressive hemiparesis of the upper and lower right limbs, with a final diagnosis of SPS.