title: Risk Factor Analysis for the Recurrence of Chronic Subdural Hematoma: A Review of 368 Consecutive Surgical Cases.
abstract: OBJECTIVE
  Chronic subdural hematoma (CSDH) is a common form of extra axial hemorrhage in the elderly. A surgical procedures such as a burr hole trephination are used for the CSDH treatment. The recurrence rate of CSDH is reported to range from 2.3 to 33%. In the current study, we focused on the determination of risk factors associated with the recurrence of CSDH.
  
  
  METHODS
  We retrospectively reviewed 368 consecutive patients with CSDH treated by burr hole trephination. Univariate and multivariate analysis were performed to describe the relationships between clinical and radiological factors as well as the recurrence of CSDH.
  
  
  RESULTS
  Totally 31 (8.4%) patients experienced a recurrence of CSDH in our study. The male group (10.2%) had a higher recurrence rate than the female group (3.1%). Also patients with malignant neoplasm history showed a high recurrence rate (17.9%). The recurrence rate of single layer CSDH (13.1%) and isodensity CSDH (11.7%) was highly significant also.
  
  
  CONCLUSIONS
  Sex, history of malignant neoplasm and the hematoma type on computed tomography were factors related with the recurrence of CSDH in our study. These findings may be supportive in the identification of patients at risk for a recurrence of CSDH.
authors.affiliation: Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Junhak
authors.initials: J
authors.lastname: Kim
authors.affiliation: Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Jongun
authors.initials: J
authors.lastname: Moon
authors.affiliation: Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Tackeun
authors.initials: T
authors.lastname: Kim
authors.affiliation: Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Seongyeol
authors.initials: S
authors.lastname: Ahn
authors.affiliation: Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Gyojun
authors.initials: G
authors.lastname: Hwang
authors.affiliation: Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Jaeseung
authors.initials: J
authors.lastname: Bang
authors.affiliation: Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: O-Ki
authors.initials: OK
authors.lastname: Kwon
authors.affiliation: Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea.
authors.forename: Chang Wan
authors.initials: CW
authors.lastname: Oh
keywords: Hematoma, subdural, chronic; Recurrence; Risk factors