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Preservation rhinoplasty may refer to preserving several anatomic components including the nasal bones, upper lateral cartilages, the keystone area and/or ligaments of the nose. Preserving the osseocartilaginous framework or "dorsal preservation" minimizes or completely avoids violation of the dorsal aesthetic lines' architecture. Conventional hump reduction in open rhinoplasty disrupts these lines; however, it also provides versatility to reshape the entire dorsum. Surgical success with either technique requires a thorough understanding of the underlying nasal anatomy.Preservation rhinoplasty is making a resurgence as a reliable method of performing primary rhinoplasty. Dorsal preservation is an important part of the approach to preserve favorable nasal contours when performing rhinoplasty. Keys to success require proper patient selection and careful execution. There are potential sequelae, such saddle nose deformity, recurrence of the dorsal convexity, cerebrospinal fluid leak, and radix step-off. This article discusses methods and adjustments in technique to help minimize these potential problems when performing dorsal preservation.Dorsal hump reduction is a key component of rhinoplasty. Spreader grafts are the most frequently used technique; however, dorsal irregularities may result. The modified Skoog method involves removal of the osseocartilaginous dorsal hump, its modification, further reduction of the nasal dorsum, replacement of the modified dorsal segment, and suspension of the upper lateral cartilages. The dorsal segment acts as an onlay spreader graft, preserves the middle vault, closes the open roof deformity, and creates a smooth dorsal contour from radix to anterior septal angle. The modified Skoog method produces optimal functional and aesthetic outcomes in appropriately selected patients.Crooked or deviated noses pose a specific challenge as many of the elements in a deviated nose are not symmetric and therefore not ideal for preservation techniques. Deviated noses are often where a hybridization between preservation and structural rhinoplasty is required. Careful preoperative evaluation of the soft tissue and bony anatomy of the patient is very important and congenital or post-traumatic asymmetry may involve more than the nasal pyramid. Full exposure of the nasal pyramid allows for visualization and appropriate osteotomy or rhinosculpture.Dorsal preservation rhinoplasty has aesthetic advantages over conventional hump takedown rhinoplasty. In dorsal preservation surgery, the nasal vault is treated en bloc. The internal nasal valve angle is not disrupted and there is no need for midvault reconstruction. Two techniques for management of the bony vault exist in dorsal preservation surgery the let-down and the push-down techniques. There are a variety of techniques used for management of the septum in dorsal preservation. Available patient-reported outcomes of suggest positive results in nasal breathing. LTGO-33 More robust data are needed to clarify the functional results of dorsal preservation and compare breathing outcomes.For rhinoplasty surgeons, surgery of the dorsum has never been so dynamic or as easily learned. Reproducible techniques offer excellent results that can be difficult to achieve in certain patients using component reduction. An expanding repertoire of dorsal preservation (DP) techniques is evolving. Each DP operation builds on the others. To understand DP requires a new appreciation of the cartilaginous septum, the perpendicular plate of ethmoid, nasal osteotomies, and anatomy of the nose where surgeons do not operate with traditional component reduction. The result is more beautiful noses where the normal anatomy is preserved.There are 2 approaches for lowering the osseocartilaginous nasal dorsum. The most frequently used method includes resection of the osseocartilaginous nasal dorsum. The second method is based on preservation of the osseocartilaginous nasal dorsum. The concept of dorsal preservation surgery is to preserve, not resect, the nasal bones and upper lateral cartilage. Reduction rhinoplasty with preservation of the nasal dorsum is not only possible, but results in a natural appearing postoperative dorsal esthetic line. Thus, the rhetorical question Why reconstruct the nasal dorsum when you can simply preserve it?Functional neuroimaging provides means to understand the relationship between brain structure and associated functions. Functional MR (fMR) imaging can offer a unique insight into preoperative planning for central nervous system (CNS) neoplasms by identifying areas of the brain effected or spared by the neoplasm. BOLD (blood-oxygen-level-dependent) fMR imaging can be reliably used to map eloquent cortex presurgically and is sufficiently accurate for neurosurgical planning. In patients with brain tumors undergoing neurosurgical intervention, fMR imaging can decrease postoperative morbidity. This article discusses the applications, significance, and interpretation of BOLD fMR imaging, and its applications in presurgical planning for CNS neoplasms.Dynamic functional connectivity adds another dimension to resting-state functional MR imaging analysis. In recent years, dynamic functional connectivity has been increasingly used in resting-state functional MR imaging, and several studies have demonstrated that dynamic functional connectivity patterns correlate with different physiologic and pathologic brain states. In fact, evidence suggests that dynamic functional connectivity is a more sensitive marker than static functional connectivity; therefore, it might be a promising tool to add to clinical functional neuroimaging. This article provides a broad overview of dynamic functional connectivity and reviews its general principles, techniques, and potential clinical applications.Resting state functional MR imaging methods can provide localization of the language system; however, presurgical functional localization of the language system with task-based functional MR imaging is the current standard of care before resection of brain tumors. These methods provide similar results and comparing them could be helpful for presurgical planning. We combine information from 3 data resources to provide quantitative information on the components of the language system. Tables and figures compare anatomic information, localization information from resting state fMR imaging, and activation patterns in different components of the language system expected from commonly used task fMR imaging experiments.