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Smaller but denser: postmortem changes alter the CT characteristics of subdural hematomas
Nicole Berger1, Lars C Ebert, Garyfalia Ampanozi
1Department of Forensic Medicine and Imaging, Institute of Forensic Medicine, University of Zurich, Winterthurerstrasse 190/52, 8057, Zurich, Switzerland.
Forensic Science, Medicine, and Pathology
|January 9, 2015
Summary
Postmortem changes significantly alter subdural hematoma (SDH) volume and imaging characteristics on postmortem CT (PMCT). These changes occur regardless of the postmortem interval (PMI), impacting forensic interpretations.
Area of Science:
- Forensic radiology
- Neuropathology
- Medical imaging analysis
Background:
- Subdural hematomas (SDH) are critical findings in forensic investigations.
- Interpreting SDH on postmortem CT (PMCT) can be challenging due to postmortem changes.
- Understanding these changes is vital for accurate forensic pathology assessments.
Purpose of the Study:
- To determine if postmortem changes affect subdural hematoma (SDH) volume, midline shift, and CT density.
- To investigate if the postmortem interval (PMI) influences these postmortem alterations in SDH characteristics.
Main Methods:
- Comparison of ante mortem CT (AMCT) and postmortem CT (PMCT) in 19 adults with SDH.
- Quantitative analysis of SDH volume, midline shift, and hematoma density.
- Statistical assessment of changes and correlation with postmortem interval (PMI).
Main Results:
- Postmortem CT (PMCT) showed a significant decrease in midline displacement (57%) and SDH volume (38%).
- Hematoma density increased by 18% on PMCT compared to AMCT (p < 0.001 for all).
- No significant correlation was found between the postmortem interval (PMI) and the observed changes.
Conclusions:
- Normal postmortem changes markedly affect the imaging characteristics of subdural hematomas on PMCT.
- Forensic pathologists and radiologists must recognize these alterations for accurate interpretation of SDH on PMCT.
- Awareness of these phenomena is crucial for reliable forensic evaluations of subdural hemorrhages.
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