The use of social media by medical professionals and organizations is increasing, with Twitter receiving the most attention. User engagement is an important goal of social media activity, and engagement metrics represent a viable gauge of value in social media. No thorough analysis of tweet characteristics that increase academic user engagement has yet been published. In this study, the authors analyzed the Twitter feed to determine the tweet characteristics that were associated with higher engagement rates.

Head and neck surgical reconstruction is complex, and postoperative imaging interpretation is challenging. Surgeons now use microvascular free tissue transfer, also known as free flaps, more frequently in head and neck reconstruction than ever before. Thus, an understanding of free flaps, their expected appearance on cross-sectional imaging, and their associated complications (including tumor recurrence) is crucial for the interpreting radiologist. Despite the complexity and increasing frequency of free flap reconstruction, there is no comprehensive head and neck resource intended for the radiologist. We hope that this image-rich review will fill that void and serve as a go to reference for radiologists interpreting imaging of surgical free flaps in head and neck reconstruction. ABBREVIATIONS: ALT ϭ anterolateral thigh; CECT ϭ contrast-enhanced CT; FF ϭ free flap; H&N ϭ head and neck; SCC ϭ squamous cell carcinoma Indicates open access to non-subscribers at www.ajnr.org http://dx.

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Routine non-contrast material-enhanced head CT is one of the most frequently ordered studies in the emergency department. Skull base-related pathologic entities, often depicted on the first or last images of a routine head CT study, can be easily overlooked in the emergency setting if not incorporated in the interpreting radiologist's search pattern, as the findings can be incompletely imaged. Delayed diagnosis, misdiagnosis, or lack of recognition of skull base pathologic entities can negatively impact patient care. This article reviews and illustrates the essential skull base anatomy and common blind spots that are important to radiologists who interpret nonenhanced head CT images in the acute setting. The imaging characteristics of important "do not miss" lesions are emphasized and categorized by their cause and location within the skull base, and the potential differential diagnoses are discussed. An interpretation checklist to improve diagnostic accuracy is provided. © RSNA, 2019 • Abbreviations: ASB = anterior skull base, CCJ = craniocervical junction, CPA = cerebellopontine angle, CSB = central skull base, CSF = cerebrospinal fluid, IIH = idiopathic intracranial hypertension, MCF = middle cranial fossa, PCF = posterior cranial fossa, PNS = paranasal sinuses, PPF = pterygopalatine fossa, SIH = spontaneous intracranial hypotension, TMJ = temporomandibular joint