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The computed tomographic attenuation and the age of subdural hematomas.
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MedLine Citation:
PMID:  9288636     Owner:  NLM     Status:  MEDLINE    
The sequential change in density (attenuation coefficient) of subdural hematomas (SDHs) in computed tomography (CT) is important in understanding the pathogenesis and evolution of SDHs. We retrospectively investigated the age of SDHs by CT in 446 cases. We included 30 cases of chronic SDHs, in whom the density was directly measured in the CT. The density of acute (within 7 days) SDH was hyperdense in 98.6%, isodense in 1.1%, and hypodense in 0.3% of the cases. In subacute (8-22 days) SDHs, it was hypodense in 45.7%, isodense in 42.9%, and hyperdense in 11.4%. In chronic (over 22 days) SDHs, 86.7% was isodense and only 13.3% was hypodense. In hypodense SDHs, 64.0% was the subacute, and 73.2% of the isodense SDHs was the chronic one. The mean interval from injury to CT was 0.5 +/- 1.6 days in hyperdense SDHs, 20.9 +/- 20.7 days in hypodense SDHs, and 54.9 +/- 44.0 days in isodense SDHs. In 30 cases of chronic SDH, the average density was 38.0 +/- 6.9 Hounsfield number(H) in 20 approximately 30 days, 43.8 +/- 12.8 H in 31 approximately 60 days, 51.8 +/- 5.1 H in 61 approximately 90 days, and 44.2 +/- 8.3 H in over 90 days. The density of acute SDH is usually hyperdense. It becomes hypodense within 3 weeks. Then the density progressively increases by the repeated microhemorrhage, which is the mechanism of enlargement of chronic SDH. The density of chronic SDH increases with time up to 90 days, then decreases again after maturation of the neomembrane, which is the mechanism of spontaneous resolution.
K S Lee; W K Bae; H G Bae; J W Doh; I G Yun
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of Korean medical science     Volume:  12     ISSN:  1011-8934     ISO Abbreviation:  J. Korean Med. Sci.     Publication Date:  1997 Aug 
Date Detail:
Created Date:  1997-10-23     Completed Date:  1997-10-23     Revised Date:  2011-03-16    
Medline Journal Info:
Nlm Unique ID:  8703518     Medline TA:  J Korean Med Sci     Country:  KOREA    
Other Details:
Languages:  eng     Pagination:  353-9     Citation Subset:  IM    
Department of Neurosurgery, Soonchunhyang University Chonan Hospital, Chonan, Korea.
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MeSH Terms
Acute Disease
Chronic Disease
Craniocerebral Trauma / complications*
Hematoma, Subdural / etiology,  radiography*
Middle Aged
Retrospective Studies
Tomography, X-Ray Computed*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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Journal Information
Journal ID (nlm-ta): J Korean Med Sci
Journal ID (pmc): jkms
ISSN: 1011-8934
ISSN: 1598-6357
Publisher: Korean Academy of Medical Sciences
Article Information
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Print publication date: Month: 8 Year: 1997
Volume: 12 Issue: 4
First Page: 353 Last Page: 359
ID: 3054217
PubMed Id: 9288636

The computed tomographic attenuation and the age of subdural hematomas.
K. S. Lee Email:
W. K. Bae
H. G. Bae
J. W. Doh
I. G. Yun
Department of Neurosurgery, Soonchunhyang University Chonan Hospital, Chonan, Korea.

Article Categories:
  • Research Article

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