Pnrognostic Factors in the Untreated Course of Posterior Communicating Aneurysms

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Abstract
BEFORE SURGERY is prescribed for intracranial aneurysms, the untreated course of each type of aneurysm must be shown to give results that are inferior to active intervention. A first step in the solution of this problem may be found in the use of random series in which a large group of surgically untreated patients is compared with a similar randomly selected group of treated patient. As an example of this type of analysis, in a study of aneurysms of the internal carotid artery at or near the origin of the posterior communicating artery (hereafter called posterior communicating aneurysms, or PCA), surgical treatment was found to give overall results (limited in this particular report to the acute phase) that were superior to the untreated course of the condition.1 However, the conclusion cannot be made that all patients with posterior communicating aneurysms will benefit from surgical therapy, but only that

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