True Bruise vs. Artificial Bruise
Forensic Pathology: Differentiation of Contusions
In forensic examinations, distinguishing between a vital (true) bruise and a post-mortem or artificial bruise is critical for establishing the timing and mechanism of injury.
| Feature | True (Vital) Bruise | Artificial (Post-Mortem) Bruise |
|---|---|---|
| Incised Wound | Edges are infiltrated with blood (cannot be washed away). | Edges are clean; blood can be washed away easily. |
| Clotting | Blood is usually coagulated. | Blood is typically fluid. |
| Skin Surface | Skin may show abrasion or swelling. | Skin is intact; no associated signs of trauma. |
| Dissection | Extravasation of blood into the subcutaneous tissue is firm/adherent. | Blood is superficial and lacks underlying tissue infiltration. |
Forensic High-Yield Pearls
- Histology: Presence of leucocytic infiltration (specifically neutrophils) is the gold standard for proving a bruise occurred during life.
- Post-Mortem Lividity (Hypostasis): Often mistaken for bruises. Differentiation is achieved by incising the area; in hypostasis, the blood flows out, whereas in a true bruise, the tissue is stained and cannot be washed clean.
- Educational Resource: For further study on forensic trauma analysis and practice questions, please visit mymedschool.org.