A 32-year-old male is found dead in his apartment after 8 hours. On external examination, the body shows purple-red discoloration on the dependent parts of the trunk and limbs. Which is the most common site of livor mortis appearance in this case?

## Livor Mortis: Site of Appearance **Key Point:** Livor mortis (hypostasis) appears in dependent areas due to gravitational pooling of blood in capillaries and venules after cardiac arrest and loss of vascular tone. ### Most Common Site The **lower back and buttocks** are the most frequent sites of livor mortis appearance because: 1. These are the most dependent areas when a body lies in the supine position (most common position of death) 2. Gravity causes blood to settle in these lowest points 3. The skin here is relatively thin, making discoloration more visible ### Timing and Appearance - Appears within **30 minutes to 2 hours** after death - Initially blanches with pressure (reversible) - Becomes fixed and non-blanching after **8–12 hours** due to hemoglobin denaturation - Color progresses from purple-red to dark purple ### Clinical Significance | Feature | Significance | |---------|-------------| | **Blanching** | Indicates recent death (< 8–12 hrs) | | **Non-blanching** | Suggests death occurred > 12 hrs ago | | **Absence in dependent areas** | May indicate antemortem injury or pressure | | **Unusual distribution** | May suggest body was moved postmortem | **Clinical Pearl:** Livor mortis pattern can help establish the position of the body at the time of death. If the pattern does not match the current position, it suggests postmortem movement. **High-Yield:** The most dependent areas in supine position (lower back, buttocks, posterior thighs) show livor mortis most prominently and most frequently in forensic practice.