A 42-year-old man is discovered dead in a sealed room during summer in Delhi. The body shows greenish discoloration over the lower abdomen and right iliac fossa, with formation of gas-filled blisters on the skin. The pathologist notes that these changes are most consistent with which post-mortem change?

Explanation

## Post-Mortem Changes: Putrefaction **Correct Answer: Putrefaction** The clinical presentation describes classic features of putrefaction: - **Greenish discoloration** over the lower abdomen and right iliac fossa (site of caecum with high bacterial flora) - **Gas-filled blisters** (emphysematous blisters) on the skin surface - **Timeline**: Summer heat accelerates bacterial decomposition (optimal at 37°C) ### Key Characteristics of Putrefaction: | Feature | Details | |---------|----------| | **Cause** | Bacterial action on tissues (anaerobic bacteria from gut flora) | | **Timeline** | Begins 48–72 hours in warm climates; delayed in cold | | **Color Change** | Green → Red → Purple → Black (due to hydrogen sulfide formation) | | **Location** | Starts at right iliac fossa (caecal region) | | **Gas Formation** | Hydrogen sulfide, methane, ammonia produce blisters | | **Odor** | Foul-smelling (putrid) | **Clinical Pearl:** The greenish discoloration at the right iliac fossa is pathognomonic for early putrefaction because the caecum contains the highest concentration of bacteria in the intestine. **High-Yield Fact:** In warm, humid conditions (like Delhi summer), putrefaction is the dominant post-mortem change and can progress rapidly, making time-of-death estimation challenging.