Neuroimaging clinics of North America
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Neuroimaging Clin. N. Am. · Aug 2018
ReviewEmergent Neuroimaging in the Oncologic and Immunosuppressed Patient.
Neuroimaging in the emergency department increasingly involves patients at increased risk for acute neurologic complications from malignancy and immunosuppression, including patients with organ transplantation, diabetes mellitus, treatment of chronic disease, and HIV positivity. These patients are susceptible to the same infections and emergencies as immunocompetent patients, but may present differently with common illnesses and are susceptible to a variety of other diseases. This article reviews important patient risk factors, emergent central nervous system abnormalities, and their imaging findings. Detailed knowledge of risk factors and specific complications in these complex patients is essential for optimal image acquisition, interpretation, diagnosis, and treatment.
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Neuroimaging Clin. N. Am. · Aug 2018
ReviewImaging the Unconscious "Found Down" Patient in the Emergency Department.
Unconsciousness may be due to severe brain damage or to potentially reversible causes. Noncontrast head computed tomography (CT) helps identify acute ischemic and hemorrhagic lesions as well as certain patterns of toxic encephalopathy. MR imaging plays an important role in the assessment of acutely encephalopathic patients who may show no significant abnormality on CT. This review describes some of the common and infrequent entities that can lead to unconsciousness, including epilepsy and vascular, traumatic, metabolic, and toxic disorders.
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Thunderclap headache is a common presentation in the emergency department and, although multiple causes have been described, subarachnoid hemorrhage (SAH) is the primary concern and early diagnosis is critical. CT is highly sensitive if performed within 6 hours of onset. ⋯ Further work-up should be guided by the pattern of blood. Patients with negative CT angiography may be further evaluated with MR imaging, especially patients with peripheral convexity SAH.
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Neuroimaging Clin. N. Am. · Aug 2018
ReviewCurrent Challenges in the Use of Computed Tomography and MR Imaging in Suspected Cervical Spine Trauma.
There is controversy regarding the optimal imaging strategy in adult blunt trauma patients for suspected cervical spine trauma. Some investigators recommend negative computed tomography (CT) alone to clear the cervical spine in adult blunt trauma patients, while others insist that MR imaging is necessary, especially among obtunded adult blunt trauma patients. CT is an excellent imaging modality for bony cervical spine injury; however, there is a nonzero rate of clinically significant cervical spine injuries missed on CT. MR imaging has high sensitivity for soft tissue cervical spine injuries, but low specificity for the rare isolated unstable ligamentous cervical spine injury.
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Neuroimaging Clin. N. Am. · Aug 2018
ReviewNeurologic Emergencies in Pediatric Patients Including Accidental and Nonaccidental Trauma.
This article summarizes common neurologic emergencies presenting in pediatric patients. Imaging techniques and appearances of specific conditions are detailed, including pearls and pitfalls for each presentation. Specific attention is given to differential diagnoses that can serve as mimickers of pediatric neurologic emergencies.