Atlanto-occipital distraction injuries in survivors: craniometrics and associated ligamentous, spinal cord, and blunt cerebrovascular injury.

PURPOSE: Newer classification systems for upper cervical spine trauma now include ligamentous injury in addition to fracture and dislocation patterns. Assessment of associated ligamentous injury, spinal cord injury (SCI), and blunt cerebrovascular injuries (BCVI) in patients with atlanto-occipital distraction injuries (AODI) are critical for management. We aim to determine the incidence of ligamentous injury, SCI, and BCVI in patients with AODI and assess how craniometrics perform in diagnosis of AODI. MATERIALS AND METHODS: We performed an IRB-approved retrospective analysis of 35 cases of diagnosed AODI over a period of 8 years. Imaging was analyzed by two experienced neuroradiologists for craniometric measurements, ligamentous injury, SCI, and BCVI. Craniometric measurements were compared to 35 age-matched controls with normal atlanto-occipital joint. RESULTS: Out of 35 patients diagnosed with AODI, 27 were adults and 8 belonged to pediatric age group. The mean age of presentation was 29.4 years with a male/female ratio of 22:13. The basion-dental interval (70.4%) and the combined condylar sum (74.1%) were the most sensitive craniometric measurements for diagnosis of AODI. Alar ligament (83%) and the tectorial membrane (89%) injuries were most commonly injured ligaments. Three adult patients sustained SCI and 10 patients had BCVI. Majority of BCVI involved the internal carotid artery followed by the vertebral artery. CONCLUSIONS: The combination of craniometric indices with assessment of ligamentous injuries provides higher diagnostic accuracy for AODI. Alar ligament and tectorial membrane injuries have high association with AODI. There is high association of SCI and BCVI in AODI survivors.

Trends in Neuroradiology Fellowship Match in the United States: Analysis of the 13-Year National Resident Matching Program Data.

The neuroradiology fellowship match is conducted by the National Resident Matching Program (NRMP) every year. The purpose of this study is to report the trends in neuroradiology match results from 2008 to 2020 in the United States (US) using data available from the NRMP. The fellowship match data was obtained from the NRMP archives. Data specific to programs (number of programs and filled positions) were obtained. Using the NRMP's "Charting Outcomes in the Match: Specialty Matching Service'' report, a detailed analysis of applicant characteristics broken down for each specialty, was also obtained for neuroradiology for the year 2018. Neuroradiology programs in the NRMP Match increased from 71 to 77 and the number of positions increased from 158 to 270 between 2008 and 2020. The fill rate of fellowship spots has remained steady at 75.9% in 2008 and 74.4% in 2020. The proportion of US allopathic medical graduates (US MD) amongst the filled spots decreased from 79.2% (2008) to 64.2% (2020), while the proportion of international medical graduates (IMGs) increased from 11.7% to 25.4%. US MD and IMG fill trends did not reach statistical significance (P = 0.78 and P = 0.92, respectively). US MDs had a higher number of research experiences and publications (23.2 and 26, respectively) when compared to US IMGs (5 and 7) and non-US IMGs (6.8 and 14.2). To conclude, over the last 13 years, the neuroradiology fellowship programs in the US have increased in number and expanded in size, with an almost stable fill rate of around 75%.

Ischemic Infarction in Young Adults: A Review for Radiologists.

Ischemic strokes in young adults are devastatingly debilitating and increasingly frequent. Stroke remains the leading cause of serious disability in the United States. The consequences of this familiar disease in this atypical age group are especially detrimental and long lasting. Ischemic stroke in young adults is now emerging as a public health issue, one in which radiologists can play a key role. The incidence of ischemic infarction in young adults has risen over the past couple of decades. Increased public awareness, increased use of MRI and angiography, and more accurate diagnosis may in part explain the increased detection of stroke in young adults. The increased prevalence of stroke risk factors in young adults (especially sedentary lifestyle and hypertension) may also contribute. However, compared with older adults, young adults have fewer ischemic infarcts related to the standard cardiovascular risk factors and large- or small-vessel disease. Instead, their infarcts most commonly result from cardioembolic disease and other demonstrated causes (ie, dissection). Thus, radiologists must expand their differential diagnoses to appropriately diagnose ischemic strokes and identify their causes in the young adult population. From the more frequent cardioembolism and dissection to the less common vasculitis, drug-related, CADASIL (cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy), moyamoya, and hypercoagulable state-related infarcts, this article covers a wide breadth of causes and imaging findings of ischemic stroke in young adults. ©RSNA, 2019.

Digital Medical Illustration for the Radiologist.

The adage "a picture is worth a thousand words" holds true in medicine, especially so in radiology. Although the images radiologists interpret are highly detailed, there often is no substitute for a concise diagrammatic illustration. Medical illustrations can help to clarify anatomy, pathology, and procedures-relaying complex information in a simple and easily understandable format. Medical illustrations have become ubiquitous in medical education and sought after for publications. Unfortunately, existing best-fit illustrations are not always available to complement discussion points. Thus, academicians are well served by the ability to produce their own illustrations. Although creating medical illustrations may seem unachievable to amateur artists, this is not necessarily the case. Digital illustration does not require the typical artistic skills needed for drawing with pen and paper or painting on a canvas. Radiologists of all skill levels, including those who do not view themselves as artistically inclined, can create their own high-quality original diagrams. Whether drawn freehand with a stylus or traced with a mouse, simple and complex digital works are within reach. However, the utility of illustration programs for radiologists is not inherently obvious, and discussion of useful features in the radiology literature is lacking. Digital illustration programs are accessible to most radiologists, and the process can be simplified to an easily approachable level, with illustration complexity left to the artist's discretion. Online supplemental material is available for this article. ©RSNA, 2018.

Root Cause Analysis: An Examination of Odontogenic Origins of Acute Maxillary Sinusitis in Both Immunocompetent & Immunocompromised Patients.

BACKGROUND AND PURPOSE: Dental and periodontal diseases represent important but often overlooked causes of acute sinusitis. Our goal was to examine the prevalence of potential odontogenic sources of acute maxillary sinusitis according to immune status and their associations with sinusitis. MATERIALS AND METHODS: A retrospective review of maxillofacial computed tomography studies from 2013 to 2014 was performed. Each maxillary sinus and its ipsilateral dentition were evaluated for findings of acute sinusitis and dental/periodontal disease. RESULTS: Eighty-four patients (24 immunocompetent, 60 immunocompromised) had 171 maxillary sinuses that met inclusion criteria for acute maxillary sinusitis. Inspection of dentition revealed oroantral fistula in 1%, periapical lucencies in 16%, and projecting tooth root(s) in 71% of cases. Immunocompromised patients were more likely to have bilateral sinusitis than immunocompetent patients (67% vs 33%, P = 0.005). A paired case-control analysis in a subset of patients with unilateral maxillary sinusitis (n = 39) showed a higher prevalence of periapical lucency in association with sinuses that had an air fluid level-29% of sinuses with a fluid level had periapical lucency compared with 12% without sinus fluid (P = 0.033). CONCLUSIONS: Potential odontogenic sources of acute maxillary sinusitis are highly prevalent in both immunocompetent and immunocompromised patients, although the 2 patient populations demonstrate no difference in the prevalence of these potential odontogenic sources. Periapical lucencies were found to be associated with an ipsilateral sinus fluid level. Increased awareness of the importance of dental and periodontal diseases as key components of maxillofacial computed tomography interpretation would facilitate a more appropriate and timely treatment.