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Quantitative analysis of intracranial hypostasis: comparison of early postmortem and antemortem CT findings
Naoya Takahashi1, Chihiro Satou, Takeshi Higuchi
1Department of Diagnostic Radiology, Niigata City General Hospital, 463-7 Shumoku, Chuo-ku, Niigata City, Niigata 950-1197, Japan. nandtr@hosp.niigata.niigata.jp
Insights
Postmortem hypostasis, a common finding on head CT scans, shows increased attenuation in intracranial venous sinuses. This helps differentiate it from intracranial hemorrhage in forensic and clinical imaging.
Area of Science:
- Forensic Radiology
- Medical Imaging
- Postmortem Imaging
Background:
- Postmortem changes on CT scans can be challenging to interpret.
- Differentiating postmortem changes from antemortem pathology is crucial for accurate diagnosis.
Purpose of the Study:
- To quantitatively analyze postmortem hypostasis in intracranial venous sinuses using head CT.
- To compare antemortem and postmortem CT findings to evaluate sedimentation in the heart and great vessels.
Main Methods:
- Head CT scans from 50 patients, both antemortem and postmortem, were analyzed.
- Attenuation of the superior sagittal sinus was measured at the basal ganglia level.
- Increased attenuation in other venous sinuses and sedimentation in the heart/great vessels were visually assessed.
Main Results:
- Significant increase in superior sagittal sinus attenuation postmortem (80% of cases).
- Increased attenuation observed in transverse sinus/cerebellar tentorium (48%) and heart/great vessel sedimentation (62%).
- Higher sinus attenuation correlated with heart/great vessel sedimentation.
Conclusions:
- Intracranial hypostasis is a frequent postmortem CT finding.
- Awareness of intracranial hypostasis is essential for interpreting postmortem neurologic images.
- Distinguishing hypostasis from intracranial hemorrhage is critical for accurate interpretation.
Objective:
The purpose of this study was to quantitatively analyze postmortem hypostasis in the intracranial venous sinus on head CT scans compared with the antemortem CT findings in the same patients with the aim of evaluating sedimentation in the heart and great vessels.
Materials And Methods:
A total of 50 patients on whom head CT was performed before and after death were enrolled. Attenuation in the dorsal part of the superior sagittal sinus was measured at the level of the basal ganglia on both antemortem and postmortem CT scans. Increased attenuation in the transverse sinus and cerebellar tentorium and sedimentation in the heart and great vessels were evaluated visually.
Results:
Attenuation in the dorsal part of the superior sagittal sinus increased significantly (p < 0.0001) between antemortem (42.77 ± 6.23 HU) and postmortem (49.72 ± 10.58 HU) CT in 80% of cases. Increased attenuation of the transverse sinus or cerebellar tentorium was observed in 48% of cases and sedimentation in the heart or great vessels in 62% of cases. Increased attenuation in the superior sagittal sinus was clearly evident in patients with sedimentation in the heart or great vessels (antemortem, 43.81 ± 6.17 HU; postmortem, 54.65 ± 8.51 HU) compared with the patients without evidence of sedimentation (antemortem, 41.06 ± 6.10 HU; postmortem, 41.66 ± 8.57 HU) (p < 0.0001).
Conclusion:
Intracranial hypostasis is a common postmortem CT finding. Radiologists and physicians who interpret postmortem neurologic images should be aware of intracranial hypostasis and differentiate this phenomenon from intracranial hemorrhage.
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