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Disc protrusion
A disc protrusion is a disease condition which can occur in some vertebrates, including humans, in which the outermost layers of the anulus fibrosus of the intervertebral discs of the spine are intact, but bulge when one or more of the discs are under pressure.
However, it should be noted that many disk abnormalities seen on MRI that are loosely referred to "herniation" are actually just incidental findings. These may be unrelated to any symptoms and are just bulges of the annulus fibrosus. Jensen and colleagues, in an MRI study of the lumbar spine in 98 ''asymptomatic'' adults, found that in more than half, there was a symmetrical extension of a disc (or discs) beyond the margins of the interspace (bulging). In 27 percent, there was a focal or asymmetrical extension of the disc beyond the margin of the interspace (protrusion), and in only 1 percent was there more extreme extension of the disc (extrusion or sequestration). These findings emphasize the importance of using precise terms in describing the imaging abnormalities and evaluating them strictly in the context of the patient's symptoms.〔Ropper AH, Samuels MA, Klein JP. Chapter 11. Pain in the Back, Neck, and Extremities. In: Ropper AH, Samuels MA, Klein JP. eds. Adams & Victor's Principles of Neurology, 10e. New York, NY: McGraw-Hill; 2014. http://accessmedicine.mhmedical.com.eres.library.manoa.hawaii.edu/content.aspx?bookid=690&Sectionid=45424419. Accessed September 29, 2015.〕
A disc protrusion may progress to a spinal disc herniation, a condition in which there is a tear in the anulus fibrosus.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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