of Volume I.- 1 Historical Aspects of Intracranial Aneurysms.- Early History.- The Early 1900s.- Angiography.- Early Surgical Advances.- Vertebrobasilar Aneurysms.- 2 The Incidence of Intracranial Aneurysm.- 3 Data I.- 1 General Overview.- Materials and Methods.- 2 Single Intracranial Aneurysms Occurring in Adults.- Data Base.- Data Processing.- Results.- Discussion.- 3 Multiple Intracranial Aneurysms Occurring in Adults.- Data Base and Data Processing.- Results.- Discussion.- 4 Intracranial Aneurysms Occurring in Children.- Data Base and Data Processing.- Results of the Analysis of Single Aneurysm Cases without Associated Conditions.- Results of the Analysis of Single Aneurysm Cases with Associated Conditions.- Multiple Aneurysms Occurring in Children.- Discussion.- 5 Giant Intracranial Aneurysms Occurring in Adults.- Results of the Analysis of Adult Giant Single Aneurysms.- Giant Multiple Aneurysms Occurring in Adults.- Discussion.- 6 Summary.- Adult Single Berry Aneurysms.- Adult Multiple Berry Aneurysms.- Childhood Aneurysms.- Adult Giant Aneurysms.- 4 Data II.- Tables.- 5 Signs and Symptoms I General.- Signs and Symptoms.- Classification and Grading.- Summary.- 6 Signs and Symptoms II Specific.- 1 Specific Aneurysms.- Aneurysms of the Internal Carotid Artery and Its Branches.- Aneurysms of the Middle Cerebral Artery.- Aneurysms of the Anterior Communicating Artery.- Aneurysms of the Anterior Cerebral Artery.- Aneurysms of the Basilar Artery and Its Branches.- Aneurysms of the Vertebral Artery and Its Branches.- 2 Giant Aneurysms.- Signs of Sellar/Suprasellar Tumor.- Bruit.- Convulsive Seizures.- Trigeminal Neuralgia.- Other Findings.- 7 Signs and Symptoms III Ophthalmic.- Cranial Nerves 3, 4, 5, and 6.- Cranial Nerve 2.- Summary.- 8 Secondary Complications of the Subarachnoid Hemorrhage.- Elevated Intracranial Pressure.- Hydrocephalus.- Intracranial Hematoma.- Vasospasm.- Ischemia and Infarction.- Fluid and Electrolyte Disorders.- Rebleeding.- Epileptic Seizurelæ