This issue of Neurosurgery Clinics focuses on Controversies in Spinal and Cranial Surgery. Article topics will include:Sacro-illiac Fusion; Interspinous Spacers;Bone Morphogenetic Protein, Platelet Concentrates and Other Biologics; MIS decompression; Pipeline flow diversion in subarachnoid hemorrhage; Direct versus indirect bypass for moyamoya disease; Management of prenatally diagnosed myelomeningocele; Management of incidental aneurysm; Surgical management of incidental low-grade glioma; and more!