Neuroimaging clinics of North America
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Neuroimaging Clin. N. Am. · Nov 2021
ReviewImaging of Skull Base Trauma: Fracture Patterns and Soft Tissue Injuries.
This article provides an overview of the patterns of skull base trauma and provides a review of the pertinent soft tissue injuries and complications that can ensue. A brief review of skull base anatomy is provided with subsequent focus on the important findings in anterior, central, and posterior skull base trauma.
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The sellar and parasellar region is complex, with a unique meningeal, neural, vascular, and bony anatomy. Understanding the imaging anatomy is critical for accurate imaging interpretation. resonance (MR) imaging is the primary modality for pituitary imaging, whereas computed tomography may be used when MR imaging is contraindicated, and provides complementary bony anatomic information. This article reviews embryology and anatomy of the sellar and parasellar region. Imaging appearances of pituitary adenomas, Rathke cleft cysts, meningiomas, craniopharyngiomas, arachnoid cysts, vascular disorders, infectious abnormalities, and pituitary apoplexy are discussed and illustrated.
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Neuroimaging Clin. N. Am. · Nov 2021
ReviewPatterns of Perineural Skull Base Tumor Extension from Extracranial Tumors.
Perineural extension is an increasingly recognized pathway of extension of cutaneous, mucosal, and salivary gland neoplasms associated with a severe adverse prognosis. Imaging identification is feasible by MR imaging 3-dimensional contrast-enhanced submillimetric sequences. ⋯ PET with computed tomography may aid in the identification of the primary tumor location or recognition of recurrence, but only in conjunction with MR imaging does it achieve similar detection rates for perineural extension. Computed tomography scanning is an adjunct to MR imaging to increase specificity and for surgical treatment planning.
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Thyroid hormones T3 and T4 are crucial for development and differentiation of various cells in the body. They are also essential for regulating metabolism in nearly all tissues. ⋯ The thyroid can take up radioactive iodine just like it would take iodine and hence can be used to evaluate and treat several thyroid diseases. Radioactive iodine is one of the first radioisotopes to be used in medicine.