The authors retrospectively reviewed the medical records as well as the pre and postoperative computed tomography (CT) scans of the 182 patients who underwent burr-hole trephination from January 2008 to December 2012. There were 131 male (71.9%) and 51 (28.1%) female in this study, ranging in age from 24 to 94 years old (median age : 68.12 years old). The patients were divided into two groups according to the recurrence of CSDH. The clinical and radiological factors were compared between the recurrence group and the no recurrence group. In this study, 35 patients with bilateral CSDH were excluded in analyzing the CT density, the width of hematoma, the degree of air collection, the number of burr hole, and the drainage tube.
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Jung et al. (2015) studied this question.
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