During autopsy of a victim of a gunshot wound, the forensic pathologist observes the following findings: inward beveling of bone at the wound site, presence of an abrasion collar, and soot deposition in the wound tract. Which of the following statements about these findings is NOT correct?

Explanation

## Bone Beveling and Wound Direction in Firearm Injuries ### Bone Beveling: Entry vs. Exit **Key Point:** Bone beveling is one of the most reliable indicators of bullet direction, but it is NOT absolute. #### Inward Beveling (Entry Wound) - Cone-shaped defect with the apex pointing inward - Occurs because the bullet creates a temporary cavity that compresses bone inward - The inner surface of bone is beveled (sloped inward) - **Highly suggestive of entry wound** #### Outward Beveling (Exit Wound) - Cone-shaped defect with the apex pointing outward - Occurs because the bullet exits with force, pushing bone outward - The outer surface of bone is beveled (sloped outward) - **Highly suggestive of exit wound** ### The Critical Exception **Warning:** Inward beveling is NOT pathognomonic for entry wounds. Inward beveling can occur at exit wounds if: 1. The bullet fragments or breaks apart inside the body 2. The bullet tumbles or yaws (rotates end-over-end) during passage 3. A fragment of bone is driven inward by the exiting bullet 4. Multiple bullets pass through the same defect **High-Yield:** The statement "inward beveling can also occur at exit wounds if the bullet fragments or tumbles" is technically possible but is NOT the standard teaching. The standard forensic pathology teaching is that: - **Inward beveling = Entry wound (reliable)** - **Outward beveling = Exit wound (reliable)** While exceptions exist in theory, they are rare and not the basis of standard wound direction determination. ### Other Indicators of Entry vs. Exit | Feature | Entry Wound | Exit Wound | |---------|-------------|------------| | **Bone beveling** | Inward | Outward | | **Abrasion collar** | Present | Absent | | **Marginal blackening** | Present | Absent | | **Soot/Fouling** | Present (close range) | Absent | | **Tattooing** | Present (intermediate range) | Absent | | **Size** | Smaller | Larger | ### Soot Deposition (Fouling) **Key Point:** Soot is unburned gunpowder deposited in the wound tract and surrounding tissue. - **Contact/near-contact wounds (< 15 cm):** Soot is deposited in the wound tract and surrounding tissues - **Intermediate range (15 cm – 1 m):** Powder tattooing (abrasion from powder grains) without soot - **Distant range (> 1 m):** No soot or tattooing **Clinical Pearl:** Soot is ONLY found at entry wounds because it travels along the bullet's path into the body. Exit wounds never have soot. ### Abrasion Collar **Key Point:** The abrasion collar is a definitive sign of an entry wound and is NEVER present at exit wounds.