Surg Neurol
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Two cases opf bacterial meningitis due to streptococci occurred following Pantopaque myelography. These are, to our knowledge, the first reports of Streptococcus mitus and group G streptococcus causing meningitis in this situation. These 2 cases emphasize the importance of considering the possibility of bacterial meningitis following myelography and the difficulty in differentiating it on clinical grounds from the more common aseptic meningitis that occurs after myelography. They also emphasize the importance of maintaining strict sterile technique during myelography.
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The relationship between the afferent artery and the site of aneurysmal neck and hemodynamics in the anterior part of the circle of Willis was investigated from surgical and angiographic findings in 213 patients with anterior communicating artery aneurysms. An afferent artery was limited to the dominant A1 in about 95% of them. The neck of an aneurysm was more than three times greater at the bifurcation of the dominant A1 and the anterior communicating artery than at the bifurcation of the non-dominant A1 and the anterior communicating artery.