A 58-year-old woman is found dead in her bedroom in Bangalore (ambient temperature 22°C, humidity 70%) on a winter morning. She had been missing for 4 days. On autopsy, the body shows fixed livor mortis on the dependent areas, rigor mortis is completely absent, and there is early putrefaction with greenish discoloration over the right lower abdomen. The cornea is cloudy and the sclera shows a thin red line (tache noire). What is the most likely post-mortem interval?
A. 72–96 hours
B. 24–36 hours
C. 36–48 hours
D. 48–72 hours
Explanation
Post-mortem Interval Estimation in Moderate Temperature
Clinical Findings Analysis
High-YieldNEET PG
The key markers here are:
1.
Fixed livor mortis — indicates >12 hours (becomes fixed and non-blanching after 8–12 hours)
2.
Absent rigor mortis — indicates >48–72 hours (rigor fades by 48–72 hours in normal conditions)
3.
Early putrefaction (greenish discoloration, tache noire) — indicates 24–72+ hours
4.
Tache noire (red line on sclera) — a classic sign of early putrefaction, typically 24–48 hours onward
Tache Noire: A Specific Sign
Mnemonic
TACHE = Transient Area of Congestive Hyperemia on the Eye
Appears as a thin red line at the junction of the cornea and sclera
Caused by drying and congestion of exposed conjunctiva
Emerges at 24–48 hours in normal conditions
Persists for days
Not time-specific alone but supports 24+ hours
Temperature Effect (22°C — Moderate)
Key Point
At 22°C (moderate temperature, winter Bangalore), decomposition proceeds at a normal to slightly slower rate compared to tropical heat. The "standard" PMI timeline applies reasonably well.
Table
Post-mortem Change
24–36 hrs
36–48 hrs
48–72 hrs
72–96 hrs
Livor mortis
Fixed
Fixed
Fixed
Fixed
Rigor mortis
Fading/absent
Absent
Absent
Absent
Corneal clouding
Present
Present
Present
Present
Tache noire
Emerging/present
Present
Present
Present
Greenish discoloration
Early/minimal
Early
Early–moderate
Moderate–advanced
Putrefaction stage
Early
Early
Early–moderate
Moderate
Why 48–72 Hours?
Clinical Pearl
The combination of:
Completely absent rigor mortis (rules out <48 hours; rigor would still be present or fading at 36–48 hours)
Fixed livor mortis (consistent with >12 hours; non-specific for timing)
Tache noire (present; consistent with 24+ hours)
Early putrefaction (greenish discoloration; consistent with 24–72+ hours)
4-day absence (discovery at ~96 hours, but PMI is typically shorter than discovery interval if body was hidden/undiscovered)
The absence of rigor mortis is the strongest discriminator. At 48–72 hours in a 22°C environment, rigor would be completely gone. At 36–48 hours, some rigor might still be fading. The early putrefaction and tache noire fit the 48–72-hour window well.
Why Not 72–96 Hours?
At 72–96 hours, putrefaction would be more advanced (not just "early"), and there might be more pronounced skin discoloration and gas distension. The description of "early putrefaction" suggests the earlier end of the range.
High-YieldNEET PG
In forensic practice, when rigor is completely absent and putrefaction is early, the PMI is typically 48–72 hours in temperate conditions.
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