Postmortem temporal chest CT and its pathological correlation in piglets.

Area of Science:

• Forensic Pathology
• Radiology
• Postmortem Imaging

Background:

• Post-mortem computed tomography (PMCT) aids in determining the cause of death.
• Understanding natural postmortem changes, like lung hypostasis, is essential for accurate PMCT interpretation.
• The temporal evolution of postmortem lung findings requires detailed investigation.

Purpose of the Study:

• To investigate the natural time-course changes of postmortem chest CT findings in piglets.
• To correlate these CT findings with pathological changes in the lungs.
• To establish a baseline for interpreting lung abnormalities in postmortem imaging.

Main Methods:

• Serial chest PMCT scans were performed hourly for 24 hours on four piglets.
• Autopsies and pathological examinations of lung tissues were conducted immediately after the final CT scan.
• Reference pathological specimens were prepared from two additional piglets immediately after death.

Main Results:

• Ground glass attenuation (GGA) appeared in the lungs several hours postmortem and gradually increased over time.
• Histological examination confirmed that GGA corresponded to pulmonary edema.
• Increased CT attenuation was more pronounced in the dorsal regions of the lungs; consolidation and pleural effusion were absent.

Conclusions:

• Ground glass attenuation in the lungs is a natural postmortem process, indicative of pulmonary edema.
• Distinguishing time-dependent GGA from pathological findings is critical for accurate cause-of-death determination using PMCT.
• This study provides a temporal reference for lung changes observed in postmortem CT examinations.