Medicolegal Autopsies Practice Questions

Q: What is a characteristic feature of postmortem clots?

Can be washed away. ### Explanation The differentiation between a **postmortem clot** and an **antemortem thrombus** is a high-yield topic in forensic pathology. **1. Why the correct answer is right:** Postmortem clots occur due to the settling of blood after death. Because they form in stagnant blood without the physiological process of active blood flow or platelet aggregation, they **do not adhere to the vessel wall**. Consequently, they can be easily **washed away** under a stream of water or removed without damaging the underlying endothelium. Grossly, they often exhibit a "currant jelly" (red) or "chicken fat" (yellow) appearance. **2. Why the incorrect options are wrong:** * **Laminated (B):** This is a feature of **antemortem thrombi**. They show "Lines of Zahn," which are microscopic or macroscopic laminations caused by alternating layers of platelets/fibrin (pale) and red blood cells (dark). * **Rubbery (C):** Postmortem clots are typically **soft, gelatinous, and friable**. A "rubbery" or firm consistency is characteristic of an antemortem thrombus, which is toughened by fibrin cross-linking. * **Variegated (D):** Antemortem thrombi often have a variegated (mottled) appearance due to the Lines of Zahn. Postmortem clots are usually more uniform in color within their specific layers (red or yellow). ### High-Yield Clinical Pearls for NEET-PG: * **Lines of Zahn:** Definitive evidence that a clot formed in flowing blood (antemortem). * **Chicken Fat Clot:** A type of postmortem clot formed when RBCs settle (due to gravity/ESR) before the blood coagulates, leaving a clear, yellowish supernatant of plasma and fibrin on top. * **Vessel Wall:** In antemortem thrombi, the underlying vessel wall is often damaged or shows atherosclerotic changes; in postmortem clots, the endothelium remains smooth and intact.

Q: What is the specific gravity of unrespired lung tissue?

1.04. ### Explanation The specific gravity of lung tissue is a critical parameter in forensic pathology, particularly in cases of suspected infanticide to determine if a newborn was born alive (respired) or stillborn (unrespired). **1. Why 1.04 is Correct:** The specific gravity of **unrespired (fetal) lung tissue** is approximately **1.04 to 1.05**. Before the first breath, the lungs are solid, liver-like (hepatization), and contain no air. Since their density is greater than water (specific gravity > 1.0), unrespired lungs will **sink** when placed in water. This is the physiological basis for the **Hydrostatic Test (Raygat’s Test)**. **2. Analysis of Incorrect Options:** * **A (0.94):** This is incorrect. Once a child breathes, the introduction of air lowers the overall density of the lung tissue to approximately **0.94 to 0.95**. Because this is less than 1.0, respired lungs will **float** in water. * **B (1.2):** This value is too high for lung tissue; it is closer to the specific gravity of compact bone or concentrated urine. * **C (0.75):** This is significantly lower than the density of even fully aerated lung tissue. **3. High-Yield Clinical Pearls for NEET-PG:** * **Hydrostatic Test:** Positive (floats) = Live birth; Negative (sinks) = Stillbirth. * **False Positives (Floats despite stillbirth):** Occur due to **putrefaction** (gas formation) or artificial respiration. * **False Negatives (Sinks despite live birth):** Occur in cases of severe atelectasis, pneumonia, or pulmonary edema. * **Foderé’s Test:** Another name for the static hydrostatic test. * **Wredin’s Test:** Examination of the middle ear; disappearance of the gelatinous embryonic connective tissue indicates live birth (takes about 24 hours).

Q: In a medico-legal dispute, after postmortem, to whom should the body be handed over?

Investigating officer. **Explanation:** In a medicolegal autopsy, the chain of custody and legal procedure are paramount. The autopsy is conducted at the request of the legal authorities (Police or Magistrate) to determine the cause and manner of death. **Why the Investigating Officer (IO) is correct:** Once the postmortem examination is complete, the medical officer officially hands over the body to the **Investigating Officer (IO)** or the police constable who brought the dead body and the requisition. Legally, the body is considered "property" of the state during the investigation. It is the responsibility of the IO to then complete the necessary paperwork and formally release the body to the legal heirs for final rites. **Analysis of Incorrect Options:** * **Magistrate:** While a Magistrate orders a "Magisterial Inquiry" (under Section 176 CrPC) in specific cases like custodial deaths or dowry deaths, they do not physically take custody of the body post-autopsy. * **Patient’s Relatives:** The doctor should **never** hand over the body directly to the relatives in a medicolegal case. This bypasses the legal chain of custody and can lead to procedural lapses in the criminal investigation. * **Coroner:** The Coroner system has been abolished in India (the last being in Mumbai in 1999). Even under that system, the police acted as the intermediary for the physical custody of the body. **High-Yield Facts for NEET-PG:** * **Section 174 CrPC:** Police Inquiry (Inquest) conducted by an officer not below the rank of Sub-Inspector. * **Section 176 CrPC:** Magisterial Inquiry (mandatory for custodial deaths, rape in custody, or death within 7 years of marriage). * **Dead Body Challan:** The document sent by the police to the doctor requesting an autopsy. * **Viscera Preservation:** If the cause of death is not clear, viscera are preserved and handed over to the **Police** (IO) in sealed jars to be transported to the Forensic Science Laboratory (FSL).

Q: In case of gout, preservation of a urine sample is done in which solution?

Alcohol. ### Explanation **Correct Option: C. Alcohol** The primary objective in cases of gout is the identification of **monosodium urate (MSU) crystals**. These crystals are highly **water-soluble**. If a urine or tissue sample is preserved in an aqueous (water-based) solution, the crystals will dissolve, making microscopic diagnosis impossible. **Absolute alcohol** (or 95% ethanol) is the preferred preservative because it does not dissolve the crystals, allowing them to be visualized under polarized microscopy, where they exhibit characteristic **strong negative birefringence**. **Analysis of Incorrect Options:** * **A. Normal Saline:** This is an isotonic aqueous solution. Because it is water-based, it will lead to the dissolution of urate crystals. * **B. Formalin:** Standard 10% buffered formalin is the most common fixative for routine histopathology. However, it is an aqueous solution and will dissolve urate crystals. If formalin must be used, it should be non-aqueous or the sample must be processed rapidly, but alcohol remains the gold standard. * **D. Distilled Water:** This is the worst choice as it is a pure solvent that will rapidly dissolve the crystals and cause osmotic lysis of any cellular elements. **High-Yield Clinical Pearls for NEET-PG:** * **Gouty Tophi:** When sending a biopsy of a suspected tophus, it must be sent in **absolute alcohol**, not formalin. * **Polarized Microscopy:** MSU crystals appear **needle-shaped** and show **yellow** color when parallel to the axis of the compensator (Negative Birefringence). * **Pseudogout:** Caused by Calcium Pyrophosphate Deposition (CPPD). These crystals are **rhomboid-shaped** and show **weak positive birefringence** (Blue when parallel). * **Other Alcohol Preservations:** Alcohol is also used as a preservative for **viscera in cases of suspected phosphorus poisoning** (as it prevents oxidation) and for certain toxicological analyses when saturated saline is unavailable.

Q: Which of the following is the Gettler test used to detect?

Drowning. **Explanation:** The **Gettler Test** (also known as the Chloride Test) is a biochemical test used to support the diagnosis of **drowning**. It is based on the principle of hemodilution or hemoconcentration that occurs when a person inhales water into the lungs before death. * **Mechanism:** When a person drowns in **freshwater**, the hypotonic water enters the pulmonary circulation, causing hemodilution and a **decrease in chloride concentration** in the left atrium of the heart compared to the right. Conversely, in **saltwater** drowning, the hypertonic water causes hemoconcentration, leading to an **increase in chloride levels** in the left atrium. A difference of more than **25 mg/dL** between the two chambers is considered significant. **Analysis of Incorrect Options:** * **B & D (Hanging and Strangulation):** These are forms of mechanical asphyxia. Diagnosis relies on physical findings like the ligature mark, subconjunctival hemorrhages (Tardieu spots), and fractures of the hyoid bone or thyroid cartilage, rather than biochemical blood tests. * **C (Arsenic Poisoning):** This is detected using the **Marsh Test** or Reinsch Test, which identifies the presence of heavy metals in tissues, hair, or nails. **High-Yield Clinical Pearls for NEET-PG:** * **Reliability:** The Gettler test is now considered largely **obsolete** in modern forensics because post-mortem putrefaction and electrolyte shifts rapidly alter results. * **Diatom Test:** This is currently the "Gold Standard" for diagnosing ante-mortem drowning, especially in putrefied bodies. * **Edas-Lung:** Refers to the heavy, sodden, and voluminous lungs found in freshwater drowning. * **Paltauf’s Hemorrhages:** Subpleural ecchymoses found in the lungs of drowning victims due to the rupture of alveolar walls.

Q: Which of the following statements about exhumation is true?

An executive magistrate can order for exhumation.. ### Explanation **1. Why Option B is Correct:** Exhumation is the lawful disinterment of a buried body for medicolegal purposes. In India, the authority to order an exhumation rests solely with the **Executive Magistrate** (such as a District Magistrate or Sub-Divisional Magistrate). This is governed by **Section 176(3) of the CrPC** (now Section 196 of the BNSS), which empowers the magistrate to cause a body to be disinterred to discover the cause of death. **2. Why the Other Options are Incorrect:** * **Option A:** The Police do not have the legal authority to order an exhumation. They must apply to the Executive Magistrate to obtain the necessary order. * **Option C:** A postmortem examination **can and must** be performed on an exhumed body. Even in cases of advanced decomposition, skeletal remains or preserved tissues (like hair or nails) can provide vital evidence regarding the cause of death, identity, or poisoning. * **Option D:** **Section 176(3) CrPC** deals with the order of exhumation. Section 176(1) relates to inquiries by Magistrates into causes of death (custodial deaths), but the specific provision for disinterment is 176(3). **3. High-Yield Clinical Pearls for NEET-PG:** * **Time Limit:** In India, there is **no time limit** for exhumation (unlike some countries like France, where it is 10 years). * **Procedure:** It should ideally be performed in the **early morning** to avoid public gaze and heat. * **Samples:** In cases of suspected poisoning where the body is decomposed, the **earth/soil** from above, below, and around the coffin/body must be collected as a control sample to rule out environmental contamination (e.g., arsenic in soil). * **Presence:** The exhumation must be conducted in the presence of a Medical Officer and the Executive Magistrate.

Q: In suspected cases of hanging, which cavity is typically opened first during autopsy?

Head. **Explanation:** In forensic pathology, the standard sequence of opening cavities is usually Abdomen → Thorax → Head. However, in cases of **hanging or strangulation**, this sequence is modified to prevent false-positive findings. **Why the Head is opened first:** The primary reason for opening the head first in suspected hanging is to **drain the blood from the neck and cranial vessels.** By removing the brain and opening the dural sinuses, the hydrostatic pressure in the cervical vessels is reduced. This ensures that when the neck is subsequently dissected, any hemorrhages observed in the neck muscles or soft tissues are **true antemortem injuries** and not "artificial" hemorrhages (post-mortem artifacts) caused by the congestion of blood or accidental vessel rupture during dissection. **Analysis of Incorrect Options:** * **Thorax & Abdomen:** While these are usually opened first in routine autopsies (to observe the height of the diaphragm and organ positions), opening them before the head in hanging cases does not sufficiently drain the venous congestion in the neck. * **Neck:** The neck is always opened **last**. If the neck is opened while the head and thorax are intact, the trapped blood under pressure will spill into the tissues, creating artifacts that mimic bruising, making it impossible to distinguish between antemortem hanging and post-mortem manipulation. **High-Yield Clinical Pearls for NEET-PG:** * **Modified Sequence:** In hanging/strangulation: **Head → Thorax/Abdomen → Neck.** * **Virchow’s Technique:** The most common method where organs are removed one by one. * **Rokitansky Technique:** In-situ dissection of organs. * **Ghon’s Technique:** Removal of organs in functional blocks (en bloc). * **Letulle’s Technique:** Removal of all viscera as a single mass (en masse).

Q: What is the ideal temperature for preserving a body for postmortem examination?

4°C. **Explanation:** The primary goal of body preservation before a medicolegal autopsy is to delay **putrefaction** (decomposition) while preventing structural damage to the tissues. **Why 4°C is the Correct Answer:** At **4°C (40°F)**, bacterial growth and enzymatic activity (autolysis) are significantly slowed down, but the body fluids do not freeze. This temperature effectively halts the rapid progression of decomposition for several days, allowing for an accurate assessment of postmortem changes and injuries. **Analysis of Incorrect Options:** * **0°C (Option A):** This is the freezing point of water. Maintaining a body exactly at 0°C risks partial freezing, which can lead to ice crystal formation in the cells, distorting histopathological findings. * **10°C (Option C):** This temperature is too high. While cooler than room temperature, it is insufficient to stop the proliferation of putrefactive bacteria (like *Clostridium welchii*), leading to rapid bloating and discoloration. * **-10°C (Option D):** Deep freezing is only used for long-term storage (weeks or months) when an autopsy is delayed. However, it is **not ideal** for routine cases because it makes the body too hard to dissect immediately and causes "freezer artifacts," which interfere with microscopic examination of tissues. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal Storage:** 4°C is the standard for short-term storage in mortuary cooling cabinets. * **Deep Freezing:** Reserved for unidentified bodies or skeletal remains; the body must be thawed before the autopsy, which accelerates decomposition once removed. * **Embalming:** Should **never** be done before a medicolegal autopsy as it destroys chemical evidence (toxicology) and alters wound morphology. * **Putrefaction:** The first external sign is a greenish discoloration over the right iliac fossa (cecum). Storage at 4°C is the most effective way to delay this.

Q: What is a suitable environmental condition for mummification?

Dry and hot air. **Explanation:** **Mummification** is a modification of putrefaction characterized by the dehydration and desiccation of the body tissues. **Why "Dry and hot air" is correct:** The process requires conditions that facilitate the rapid evaporation of body fluids while simultaneously inhibiting the growth of putrefactive bacteria. **Dry, hot air** (often accompanied by a constant breeze) acts as a dehydrating agent. As the body loses moisture rapidly, the skin becomes brown, hard, leathery, and parchment-like, adhering closely to the underlying bones. This effectively "preserves" the body for years, making it a high-yield topic for forensic identification. **Why the other options are incorrect:** * **Lying in water (A):** This typically leads to **Adipocere formation** (saponification) if the water is stagnant and warm, or rapid maceration/decomposition. * **Inside shallow soil (B) and Under earth (D):** Burial generally promotes standard putrefaction due to the presence of soil bacteria and moisture. While mummification can occur in very dry, sandy deserts, "shallow soil" or general "under earth" conditions usually provide enough moisture and microbial activity to favor decay rather than desiccation. **High-Yield Clinical Pearls for NEET-PG:** * **Timeframe:** Mummification usually takes **3 months to a year** to complete. * **Medicolegal Importance:** It preserves the features of the deceased (facilitating identification) and preserves signs of injury (like ligature marks or stab wounds) for a long duration. * **Internal Organs:** These often decompose into a brownish-black mass or powder despite the external preservation. * **Contrast:** Remember the "Rule of Haase" for fetal age and "Casper’s Dictum" for the rate of putrefaction (Air:Water:Earth = 1:2:8).

Question 1

What is a characteristic feature of postmortem clots?

Accepted Answer

Can be washed away

Answer

Laminated

Answer

Rubbery

Answer

Variegated

Question 2

What is the specific gravity of unrespired lung tissue?

Accepted Answer

1.04

Answer

0.94

Answer

1.2

Answer

0.75

Question 3

In a medico-legal dispute, after postmortem, to whom should the body be handed over?

Accepted Answer

Investigating officer

Answer

Magistrate

Answer

Patient's relatives

Answer

Coroner

Question 4

In case of gout, preservation of a urine sample is done in which solution?

Accepted Answer

Alcohol

Answer

Normal saline

Answer

Formalin

Answer

Distilled water

Question 5

Which of the following is the Gettler test used to detect?

Accepted Answer

Drowning

Answer

Hanging

Answer

Arsenic poisoning

Answer

Strangulation

Question 6

Which of the following statements about exhumation is true?

Accepted Answer

An executive magistrate can order for exhumation.

Answer

Police can order for exhumation.

Answer

A postmortem cannot be done on an exhumed body.

Answer

CrPC 176(4) is related to the enquiry of an exhumed body.

Question 7

In suspected cases of hanging, which cavity is typically opened first during autopsy?

Accepted Answer

Head

Answer

Thorax

Answer

Abdomen

Answer

Neck

Question 8

What is the ideal temperature for preserving a body for postmortem examination?

Accepted Answer

4°C

Answer

0°C

Answer

10°C

Answer

-10°C

Question 9

What is a suitable environmental condition for mummification?

Accepted Answer

Dry and hot air

Answer

Lying in water

Answer

Inside shallow soil

Answer

Under earth

Question 10

If death occurs in police custody, by whom is the investigation carried out?

Accepted Answer

Executive Magistrate

Answer

Chief Judicial Magistrate

Answer

City Magistrate

Answer

Any Magistrate

Medicolegal Autopsies — MCQs

Medicolegal Autopsies — MCQs

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