On the threshold of an exciting new era for acute stroke diagnosis and treatment, the Third International Symposium on Thrombolytic Therapy in Acute Ischemic Stroke was held in Nara, Japan, in April 1994. The symposium brought together some 200 basic and clinical scientists for presentations and discussions of issues vital to the understanding of thrombolytic therapy. This volume compiles the major presentations of the symposium, with attention to applications of new diagnostic measures such as diffusion and perfusion MRI, contrast-enhanced transcranial Doppler and angioscopy. Other presentations examine the mechanisms of ischemia/reperfusion injury, hemorrhagic transformation, and reocclusion, with reviews of recent developments in thrombolytic agents. The proceedings of the symposium will be of special interest to researchers, physicians, and students in the fields of neurology, neurosurgery, and nuclear medicine, as well as those in pharmacology, critical care medicine, and related fields.