title: Multiple Densities of the Chronic Subdural Hematoma in CT Scans.
abstract: OBJECTIVE
  Density of the chronic subdural hematoma (cSDH) is variable. It often appears to be mixed density. Multiple densities of cSDH may result from multiple episodes of trauma. We investigated the frequency of mixed density and the causes of head injuries representing each density.
  
  
  METHODS
  We could collect 242 cases of chronic SDH. The cSDHs were classified into four groups; hypodensity, homogeneous isodensity, layered type, and mixed type on the basis of CT scans.
  
  
  RESULTS
  The density of cSDH was isodense in 115 patients, hypodense in 31 patients, mixed in 79 cases, and layered in 17 cases. The cSDH was on the left side in 115 patients, on the right side in 70 patients, and bilateral in 40 patients. The history of trauma was identifiable in 122 patients. The etiology could be identified in 67.7% of the hypodense hematomas, while it was obscure in 59.5% of the mixed hematomas.
  
  
  CONCLUSIONS
  Mixed density of cSDH results from multiple episodes of trauma, usually in the aged. It is hard to remember all the trivial traumas for the patients with the mixed density cSDHs. Although there were membranes within the mixed density hematomas, burr-holes were usually enough to drain the hematomas.
authors.affiliation: Department of Neurosurgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea.
authors.forename: Hye-Ran
authors.initials: HR
authors.lastname: Park
authors.forename: Kyeong-Seok
authors.initials: KS
authors.lastname: Lee
authors.forename: Jae-Jun
authors.initials: JJ
authors.lastname: Shim
authors.forename: Seok-Mann
authors.initials: SM
authors.lastname: Yoon
authors.forename: Hack-Gun
authors.initials: HG
authors.lastname: Bae
authors.forename: Jae-Won
authors.initials: JW
authors.lastname: Doh
keywords: Chronic subdural hematoma; Computed tomography; Craniocerebral trauma; Diagnosis
references.citation: Neurol Med Chir (Tokyo). 2001 Aug;41(8):371-81
references.pmid: 11561347
references.citation: J Korean Med Sci. 1997 Aug;12(4):353-9
references.pmid: 9288636
references.citation: Neuroradiology. 1992;34(6):497-9
references.pmid: 1436458
references.citation: Acta Neurochir (Wien). 1995;137(1-2):6-14
references.pmid: 8748860
references.citation: J Neurosurg. 1979 Jan;50(1):64-9
references.pmid: 758381
references.citation: Br J Neurosurg. 2004 Aug;18(4):328-32
references.pmid: 15702829
references.citation: J Neurosurg. 1981 May;54(5):637-45
references.pmid: 7014792
references.citation: J Korean Neurosurg Soc. 2010 Jun;47(6):424-7
references.pmid: 20617086
references.citation: J Neurotrauma. 2012 Jan 1;29(1):137-42
references.pmid: 21635185
references.citation: Swiss Med Wkly. 2010 Jun 12;140(23-24):335-40
references.pmid: 20349366
references.citation: J Korean Neurosurg Soc. 2011 Dec;50(6):512-6
references.pmid: 22323938
references.citation: Neurol Med Chir (Tokyo). 2006 Jul;46(7):333-8; discussion 338-9
references.pmid: 16861826
references.citation: Acta Neurochir (Wien). 2001;143(6):613-618; discussion 618-9
references.pmid: 11534679
references.citation: J Forensic Sci. 1996 Mar;41(2):314-6
references.pmid: 8871392
references.citation: J Korean Neurosurg Soc. 2008 Jan;43(1):11-5
references.pmid: 19096538
references.citation: Surg Neurol. 2004 Jun;61(6):523-7; discussion 527-8
references.pmid: 15165784
references.citation: Brain Inj. 2004 Apr;18(4):351-8
references.pmid: 14742149
references.citation: J Neurosurg. 2002 May;96(5):877-84
references.pmid: 12005395
references.citation: Neurosurg Clin N Am. 2000 Jul;11(3):479-89
references.pmid: 10918018
references.citation: Clin Neurol Neurosurg. 2005 Apr;107(3):223-9
references.pmid: 15823679
references.citation: Acta Neurochir (Wien). 2012 Sep;154(9):1541-8
references.pmid: 22653496