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Patterned lividity - the 'underwear sign'.

Roger W Byard1,2, John D Gilbert3

  • 1Forensic Science SA, The University of Adelaide, Adelaide, Australia. roger.byard@sa.gov.au.

Forensic Science, Medicine, and Pathology
|June 7, 2022
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Summary
This summary is machine-generated.

Patterned lividity, or livor mortis, can reveal clothing worn after death. Tight garments prevented blood pooling, except where fabric patterns allowed capillary filling, offering clues for forensic analysis.

Keywords:
ForensicHypostasisLivor mortisPatterned lividityUnderwear sign

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Area of Science:

  • Forensic pathology
  • Postmortem changes
  • Medical science

Background:

  • Livor mortis is the settling of blood in dependent body areas postmortem due to gravity.
  • Patterned lividity can indicate body positioning and surface contact after death.

Purpose of the Study:

  • To investigate how tight-fitting garments affect the development of livor mortis.
  • To explore the potential of patterned lividity as an indicator of clothing worn postmortem.

Main Methods:

  • Observation of two cases with unusual patterned lividity.
  • Analysis of lividity patterns in relation to tight-fitting elastic underwear.

Main Results:

  • Tight elastic underwear prevented livor mortis in areas of consistent contact.
  • Elevated areas, such as manufacturer's lettering on the underwear, allowed lividity to form.
  • Patterned lividity was observed corresponding to the clothing's design.

Conclusions:

  • Tight-fitting clothing can alter or prevent typical livor mortis patterns.
  • Patterned lividity caused by clothing can provide valuable information in forensic investigations.
  • This phenomenon can serve as a record of garments worn shortly after death.