Medico-legal Autopsy
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Direct answer
A medico-legal autopsy exists to answer questions a clinical postmortem never asks: identity of the dead, cause and manner of death, time since death, the weapons and direction of force behind injuries, and whether poison or disease was at work. It is performed only on the authority of an inquest — in India a police inquest for most cases or a magistrate's inquest for custodial, dowry-related and other aggravated deaths, the colonial-era coroner system having been abolished. The procedure adds to the clinical dissection a layered neck examination, opening of the vertebral canal when indicated, preservation of viscera and blood for chemical analysis, and a written report that will be tested in cross-examination.
What you must remember
- Inquest types: police inquest (most unnatural deaths), magistrate's inquest (custodial deaths, dowry deaths, deaths in prison, and others the law singles out); the coroner's inquest is historical in India.
- The standard midline trunk incision runs from the symphysis menti to the pubis, deviating around the umbilicus; in suspected asphyxia the neck is examined last, layer by layer, after evisceration produces a relatively bloodless field.
- Evisceration techniques and their authors: Virchow (organ-by-organ), Rokitansky (in situ dissection), Ghon (en bloc — organs removed as cervical, thoracic and abdominal blocks), Letulle (en masse — one single mass).
- The skull is opened with a saw after reflecting the temporalis; saw dust must not enter the brain; the dura is inspected before opening.
- In suspected poisoning preserve in separate containers: stomach with contents, a portion of liver, one kidney, blood and urine — preserved in saturated common salt solution; blood for alcohol goes into sodium fluoride.
- Rectified spirit is avoided as a preservative when alcohol or volatile poisons are suspected, since it contaminates the sample.
- Exhumation in India has no statutory time limit; it is ordered by a magistrate, done where the body lies, and is best conducted in daylight.
- The autopsy surgeon must personally verify identity, record external findings including scars and tattoos before incision, and photograph injuries — the report is only as good as its documentation.
How a poisoning autopsy actually runs
An alleged organophosphate ingestion gives the full choreography. The body arrives with the police requisition and is identified by relatives; you note the clothes and any smell of garlic or solvent before undressing. Externals come first: froth at the nostrils, the state of the hands and marks of injection are recorded. The midline incision is opened, subcutaneous bruising mapped, and the peritoneum and pleura inspected for perforation or peritonitis before any organ is lifted.
Because poison is in question, the stomach is opened last among the thoraco-abdominal organs over a clean tray: you describe the contents — quantity, smell, colour, tablets, leaves — and place stomach with contents into a wide-mouthed jar of saturated saline. A wedge of liver and a kidney go into a second jar, blood into fluoride, urine into a fourth. Each jar is sealed, labelled with the autopsy number and signed across the seal so the chemical examiner's chain of custody is intact. Only after the trunk and, where indicated, the neck and spine are done does the head examination follow. The written report then answers the inquest's five questions: who, when, where, how, and by what means.
Where students slip
Three favourite traps. First, viscera jars: examiners ask "why saturated saline?" and expect "it is cheap, available and does not destroy alkaloids", and then ask "when not rectified spirit?" expecting alcohol or volatile poisoning — candidates who reverse this fail a guaranteed question. Second, the neck in hanging: opening the neck first, while the vessels are full, creates artefactual haemorrhage that will later be read as strangulation; the bloodless-field principle — neck last — is the expected answer. Third, confusing the evisceration eponyms, especially Ghon (en bloc, three blocks) with Letulle (en masse, one mass). And remember that postmortem artefacts — resuscitation rib fractures, animal predation over the eyes, traction tears — must be identified and stated, because the opposing counsel will use every unexplained finding to attack the report.
Frequently asked questions
Which inquest types operate in India?
Police inquest for most unnatural deaths and magistrate's inquest for aggravated categories such as custodial and dowry deaths; the coroner system has been abolished in India.
Name the evisceration methods with their pioneers.
Virchow — organs removed one by one; Rokitansky — dissection in situ; Ghon — en bloc removal as three organ blocks; Letulle — en masse removal of all organs together.
What viscera are preserved in a suspected poisoning, and in what?
Stomach with contents, part of the liver, one kidney, blood and urine, each in separate sealed containers, commonly in saturated common salt solution, with blood for alcohol in sodium fluoride.
Why is rectified spirit avoided in suspected alcohol poisoning?
Because spirit is itself ethanol and would contaminate the sample, making the chemical examiner's alcohol estimation worthless.
Why is the neck examined last in suspected asphyxial deaths?
Evisceration first leaves the neck relatively bloodless, so that incising it later avoids artefactual venous oozing being mistaken for ante-mortem bruising.