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Superior mesenteric artery compressing the duodenum, featuring the superior mesenteric artery syndrome. Superior mesenteric artery (SMA) syndrome is a gastro-vascular disorder in which the third and final portion of the duodenum is compressed between the abdominal aorta (AA) and the overlying superior mesenteric artery.
Spinal stenosis is an abnormal narrowing of the spinal canal or neural foramen that results in pressure on the spinal cord or nerve roots. [6] Symptoms may include pain, numbness, or weakness in the arms or legs. [1] Symptoms are typically gradual in onset and improve with leaning forward. [1]
Any forward slipping of one vertebra on another can cause spinal stenosis by narrowing the canal. If this forward slipping narrows the canal sufficiently, and impinges on the contents of the spinal column, it is spinal stenosis by definition. If associated symptoms of narrowing exist, the diagnosis of spinal stenosis is confirmed.
Resistance is affected by the length and width of a vessel (i.e. a long, narrow vessel has the greatest resistance and a short, wide one the least), but crucially, in the human body, width is generally more limiting than length because of Poiseuille's Law. Thus, if blood is presented with two paths, a short one that is narrow (with a high ...
Schaap–Taylor–Baraitser syndrome; Schaefer–Stein–Oshman syndrome; Schamberg's disease pigmentation disorder; Schamberg's disease; Scheie syndrome
Republicans have expressed interest in narrowing the number of income-driven repayment, or IDR, plans for student loan borrowers to just one. Congress created IDR plans in the 1990s to make ...
Poor oral health could be a potential risk factor for cardiovascular disease. New research shows that good oral health habits, such as flossing, may reduce the risk of stroke and atrial ...
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