Medicolegal Autopsies — MCQs

Medicolegal Autopsies Indian Medical PG Practice Questions and MCQs

Question 41: For autopsy studies, in which preservative is brain tissue typically stored?

A. Normal saline
B. EDTA
C. Sodium fluoride (NaF)
D. 10% formalin (Correct Answer)

Explanation: **Explanation:** The correct answer is **10% formalin**. In forensic and clinical pathology, the primary goal of preserving organs like the brain is **fixation**. Fixation prevents autolysis (self-digestion by enzymes) and putrefaction (bacterial decomposition) while hardening the tissue to allow for thin sectioning and histological examination. **10% Formalin** (which is a 4% solution of formaldehyde) is the standard fixative. It works by creating cross-links between proteins, effectively "freezing" the cellular structure in time. For the brain, a specific process called **"Formalin Fixing"** is often performed by suspending the whole brain in a large volume of 10% formalin for 2–3 weeks to ensure the deep structures are sufficiently hardened before slicing. **Why other options are incorrect:** * **Normal Saline:** This is an isotonic solution used for temporary hydration or washing tissues, but it has no preservative or fixative properties. Tissues left in saline will undergo rapid autolysis. * **EDTA:** This is an anticoagulant used in hematology (purple-top tubes) to prevent blood clotting by chelating calcium. It is not used for tissue fixation. * **Sodium Fluoride (NaF):** This is a preservative used specifically for **blood glucose** estimation (inhibits glycolysis) and in toxicology to prevent the metabolic breakdown of certain drugs or alcohol in blood samples. **High-Yield NEET-PG Pearls:** * **Ratio:** For effective fixation, the volume of formalin should be **10 to 20 times** the volume of the specimen. * **Saturated Salt Solution:** Used as a preservative for viscera in cases where formalin is unavailable or for specific toxicological analysis (though formalin is preferred for histopathology). * **Kaiserling’s Solution:** Used for preserving the natural color of anatomical specimens in museums. * **Rectified Spirit:** Used as a preservative for viscera in most poisoning cases (except alcohol, acetic acid, or phosphorus poisoning).

Question 42: For diatoms, what is the best site for sample collection?

A. Lungs
B. Bone marrow in Ulna
C. Bone marrow in femur (Correct Answer)
D. Muscle

Explanation: **Explanation:** The detection of diatoms is a crucial diagnostic tool in cases of suspected drowning. When a person drowns in a body of water containing diatoms, these microscopic, silica-walled algae enter the lungs, cross the alveolar-capillary membrane into the systemic circulation, and are distributed to distant organs. **Why Bone Marrow of the Femur is the Correct Answer:** The **femur** is considered the gold standard and best site for sample collection because it is a large, long bone with a robust medullary cavity. Most importantly, the bone marrow is protected by a thick layer of compact bone, which acts as a barrier against **post-mortem contamination**. If diatoms are found inside the closed marrow cavity of a long bone, it provides strong evidence that the person was alive when they entered the water (antemortem drowning), as only an active circulation could have transported the diatoms there. **Analysis of Incorrect Options:** * **Lungs (A):** While diatoms are found in the lungs, they are unreliable for diagnosis because they can enter the respiratory tract via **passive inhalation** or post-mortem submersion, leading to false positives. * **Bone marrow in Ulna (B):** While the ulna is a long bone, the femur is preferred due to its larger volume of marrow and thicker cortex, which offers better protection against contamination. * **Muscle (D):** Muscles are highly susceptible to decomposition and external contamination, making them unsuitable for reliable diatom analysis. **High-Yield Clinical Pearls for NEET-PG:** * **Acid Digestion Test:** The standard laboratory method used to extract diatoms from tissues (usually using concentrated Nitric Acid). * **Negative Diatom Test:** Does not rule out drowning (e.g., in "Dry Drowning" where laryngeal spasm prevents water entry). * **Control Sample:** Always collect a sample of the water from which the body was recovered to compare the species of diatoms found in the body.

Question 43: What is a chicken fat clot?

A. Postmortem clot (Correct Answer)
B. Thrombus
C. Infarct
D. All of the above

Explanation: ### Explanation **Correct Answer: A. Postmortem clot** **Why it is correct:** A **chicken fat clot** is a specific type of postmortem clot that forms when blood settles and clots slowly after death. When the Erythrocyte Sedimentation Rate (ESR) is high (common in infectious or inflammatory conditions), red blood cells settle rapidly due to gravity. This results in a layered clot: 1. **Currant jelly appearance:** The bottom layer, rich in RBCs, is dark red and friable. 2. **Chicken fat appearance:** The top layer, composed of fibrin and serum without RBCs, appears pale, yellowish, and translucent, resembling chicken fat. **Why the other options are incorrect:** * **B. Thrombus:** An antemortem (formed during life) blood mass. Unlike postmortem clots, thrombi are firm, friable, dry, and usually attached to the vessel wall. They exhibit **Lines of Zahn** (alternating layers of platelets/fibrin and RBCs), which are absent in postmortem clots. * **C. Infarct:** This refers to an area of tissue necrosis resulting from an interruption in blood supply (ischemia), not a type of blood clot itself. **High-Yield Facts for NEET-PG:** * **Postmortem Clots:** Are rubbery, moist, take the shape of the vessel (like a cast), and are **not attached** to the vessel wall (easily removed). * **Antemortem Thrombi:** Are dry, brittle, and **firmly attached** to the endothelial lining. * **Crucial Distinction:** If a clot is found in the pulmonary artery, distinguishing between a postmortem clot and an antemortem **Pulmonary Thromboembolism** is vital for determining the cause of death. * **Key Feature:** Postmortem clots lack the "Lines of Zahn" seen in antemortem thrombi.

Question 44: All of the following are tests to determine the stoppage of circulation except?

A. Magnus's test
B. Diaphanous test
C. Icard's test
D. Mirror held in front of a nostril (Correct Answer)

Explanation: **Explanation:** The question asks for the exception among tests used to determine the **stoppage of circulation**. In forensic medicine, the signs of death are categorized into those indicating the cessation of respiration and those indicating the cessation of circulation. **Why Option D is the correct answer:** Holding a **mirror in front of the nostrils** is a test to detect **respiration**, not circulation. If respiration persists, water vapor in the exhaled air condenses on the cool glass surface, causing "fogging." Since the question asks for the exception to circulatory tests, this is the correct choice. **Analysis of Incorrect Options (Tests for Stoppage of Circulation):** * **A. Magnus’s Test:** A finger is tightly ligated with a string. In a living person, the fingertip becomes cyanosed and swollen due to venous congestion. In death, no color change occurs because circulation has ceased. * **B. Diaphanous Test (Bouchut’s Test):** The finger webs are examined against a strong light source. In the living, the webs appear scarlet/red due to capillary blood; in death, they appear yellow/opaque. * **C. Icard’s Test:** Fluorescein dye is injected subcutaneously. If circulation is present, the skin and eyes turn greenish-yellow within minutes. No color change occurs if circulation has stopped. **High-Yield NEET-PG Pearls:** * **Winslow’s Test:** Another test for **respiration** where a saucer of water is placed on the chest; ripples indicate respiratory movement. * **Heat Test:** Applying a hot object to the skin produces a true blister (with vital reaction) in the living, but only a local singeing or "dry" blister in the dead. * **The "Gold Standard":** In modern practice, an **ECG** (for circulation) and **Flat EEG** (for brain death) are the definitive methods, superseding these traditional bedside tests.

Question 45: Which is the last organ to putrefy after death?

A. Heart
B. Prostate (Correct Answer)
C. Stomach
D. Brain

Explanation: **Explanation:** The sequence of putrefaction is a high-yield topic in Forensic Medicine, determined primarily by the muscularity and moisture content of the organ. **Why Prostate is Correct:** The **prostate** (in males) and the **non-gravid uterus** (in females) are the last organs to putrefy. This is due to their dense, fibromuscular structure and relatively low moisture content compared to other viscera. These organs are highly resistant to autolysis and bacterial action, often remaining identifiable even when the rest of the soft tissues have liquefied. This makes them crucial for sex determination in decomposed remains. **Analysis of Incorrect Options:** * **Brain (D):** This is the **first** internal organ to putrefy (along with the larynx and trachea). Due to its high water content and soft consistency, it liquefies rapidly, often becoming a "pinkish-grey paste" within days. * **Stomach (C):** Putrefies early because it contains gastric juices and bacteria, which accelerate autolysis and fermentation. * **Heart (A):** While more resistant than the brain or stomach due to its muscular nature, it putrefies much earlier than the prostate. **NEET-PG High-Yield Pearls:** * **First sign of putrefaction:** Greenish discoloration over the Right Iliac Fossa (due to H₂S reacting with hemoglobin to form sulfhaemoglobin). * **First internal organ to putrefy:** Brain, Larynx, and Trachea. * **Last organ to putrefy (Male):** Prostate. * **Last organ to putrefy (Female):** Non-gravid Uterus. * **Casper’s Dictum:** Rate of putrefaction ratio is **1:2:8** (Air : Water : Earth/Buried). An organ decomposes as much in 1 week in air as it does in 2 weeks in water or 8 weeks underground.

Question 46: Which body cavity is opened first during a post-mortem examination?

A. Head
B. Neck
C. Thorax (Correct Answer)
D. Abdomen

Explanation: **Explanation:** In a standard medicolegal autopsy, the **Thorax** is the first cavity to be opened and inspected. This sequence is primarily dictated by the need to assess the position of the diaphragm and to perform the **test for air embolism or pneumothorax**, which must be done before any other major vessels are breached or the pressure within the chest is altered. * **Why Thorax is Correct:** Opening the thorax first allows the pathologist to observe the height of the diaphragm (relevant in cases of abdominal distension or respiratory distress) and ensures that the heart and great vessels are intact for specific tests. If the head were opened first, blood drainage could empty the heart, leading to false-negative results for air embolism. * **Why Abdomen is Incorrect:** While the primary skin incision (I, Y, or Modified Y) exposes both the thorax and abdomen simultaneously, the internal examination of organs typically follows the thoracic evaluation. Opening the abdomen first can lead to the displacement of thoracic organs or obscure the diaphragmatic level. * **Why Head is Incorrect:** The cranial cavity is usually opened after the thoracic and abdominal viscera have been examined. This is because opening the head first causes blood to drain from the superior vena cava, potentially collapsing the heart and making the examination of cardiac chambers and pulmonary arteries less accurate. * **Why Neck is Incorrect:** The neck is always dissected **last**. This is a critical "high-yield" rule to ensure a bloodless field. By removing the thoracic and abdominal organs first, the neck vessels are drained of blood, allowing the pathologist to clearly distinguish between true ante-mortem bruising and post-mortem artifacts (like the Prinsloo Gordon artifact). **High-Yield Facts for NEET-PG:** * **Sequence:** Thorax → Abdomen → Head → Neck (Standard Virchow’s). * **Air Embolism Test:** Must be performed under water by piercing the right ventricle; the thorax must be opened carefully to avoid false positives. * **Neck Dissection:** Always done last to prevent "artificial" hemorrhages that could be mistaken for manual strangulation or throttling.

Question 47: What does Section 174 of the Criminal Procedure Code (CrPC) deal with?

A. Magistrate inquest
B. Police inquest (Correct Answer)
C. Medical Examiner inquest
D. None of the above

Explanation: **Explanation:** **Section 174 of the Criminal Procedure Code (CrPC)** empowers a police officer (usually the Officer-in-Charge of a police station) to conduct an investigation into cases of unnatural or suspicious deaths. This process is known as a **Police Inquest**. Upon receiving information of a suicide or homicide, the officer informs the nearest Executive Magistrate and proceeds to the spot to prepare an **Inquest Report (Panchnama)**, describing the visible state of the body and apparent cause of death in the presence of two or more witnesses. **Analysis of Options:** * **Option A (Magistrate Inquest):** This is covered under **Section 176 CrPC**. It is mandatory in specific scenarios such as custodial deaths, deaths in psychiatric hospitals, dowry deaths (within 7 years of marriage), or when the police shooting occurs. It is considered superior to a police inquest. * **Option C (Medical Examiner System):** This is a system prevalent in the USA where a doctor (forensic pathologist) conducts the inquest. This system does **not** exist in India. * **Option D:** Incorrect, as Section 174 specifically defines the police's role in death investigations. **High-Yield NEET-PG Pearls:** * **Section 174 CrPC:** Police Inquest (Most common type of inquest in India). * **Section 176 CrPC:** Magistrate Inquest (Mandatory for custodial deaths). * **Section 175 CrPC:** Power of the police to summon witnesses during an inquest. * **Coroner’s Inquest:** Formerly practiced in Mumbai and Kolkata; it was abolished in India in 1999. * The lowest-ranking police officer authorized to conduct an inquest is a **Sub-Inspector**.

Question 48: Cerebrospinal fluid (CSF) should optimally be collected within how many hours after death?

A. 4-6 hours (Correct Answer)
B. 12-16 hours
C. 16-20 hours
D. 20-24 hours

Explanation: ### **Explanation** **1. Why 4-6 hours is the correct answer:** In forensic pathology, the biochemical analysis of body fluids is a vital tool for determining the cause of death and the post-mortem interval (PMI). Cerebrospinal fluid (CSF) is relatively protected within the rigid cranio-spinal compartment; however, it is highly susceptible to **post-mortem autolysis and diffusion**. After death, the blood-brain barrier breaks down, and anaerobic glycolysis begins. This leads to a rapid rise in lactic acid and potassium levels, while glucose levels plummet. To obtain a sample that accurately reflects the biochemical state at the time of death (especially for detecting meningitis, hyperglycemia, or electrolyte imbalances), the CSF must be collected within the **"Golden Window" of 4-6 hours**. Beyond this period, the chemical composition shifts too drastically due to putrefactive changes and cellular leakage to be diagnostically reliable. **2. Why the other options are incorrect:** * **12-16 hours & 16-20 hours:** By this time, significant **hemolysis and transudation** occur. The CSF often becomes blood-tinged or turbid, and the concentration of metabolites (like urea and creatinine) equilibrates with other body tissues, making organ-specific analysis impossible. * **20-24 hours:** At this stage, **putrefaction** is well underway. Bacterial proliferation and the breakdown of proteins produce gases and foul-smelling compounds, rendering the fluid useless for clinical biochemistry. **3. NEET-PG High-Yield Pearls:** * **Site of Collection:** CSF is most commonly collected from the **Cisterna Magna** (Suboccipital puncture) during autopsy, as it remains less contaminated than the lumbar site. * **Vitreous Humor:** Often preferred over CSF for PMI estimation because it is more isolated and changes more linearly (especially **Potassium levels**, which increase steadily after death). * **Post-mortem Glucose:** CSF glucose levels drop rapidly; therefore, a high post-mortem CSF glucose is a strong indicator of **Diabetes Mellitus** or antemortem hyperglycemia. * **Lactic Acid:** Levels in CSF rise immediately after death due to hypoxia; levels above 200 mg/dL are common in the early post-mortem period.

Question 49: The "Brauslaw second life test" is used to assess function of which organ?

A. Lung
B. Liver
C. Stomach (Correct Answer)
D. Heart

Explanation: **Explanation:** The **Breslau’s Second Life Test** (also known as the Gastrointestinal Hydrostatic Test) is a medicolegal procedure used to determine whether a newborn was born alive or was a stillbirth. **Why the correct answer is right:** The test is based on the principle that a live-born infant who breathes will inevitably swallow air. This air travels from the esophagus into the **stomach** and intestines. During autopsy, the stomach and intestines are ligated at both ends, removed, and placed in water. If they float, it indicates the presence of air, suggesting the infant breathed and swallowed air (a sign of live birth). **Why the incorrect options are wrong:** * **Lung:** The test for lungs is the **Raygat’s Hydrostatic Test** (or Icard’s test). While both tests assess live birth, Breslau’s specifically focuses on the gastrointestinal tract to corroborate lung findings. * **Liver & Heart:** These organs do not contain air/gas under normal physiological conditions at birth and do not float in water unless significant decomposition (putrefaction) has occurred. They are not used in "life tests." **High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Floating:** In a live-born, air reaches the stomach first, then the duodenum, and finally the large intestine. * **False Positives:** The test can be falsely positive due to **putrefaction** (gas formation) or **artificial respiration** (mouth-to-mouth). * **False Negatives:** The test can be falsely negative if the infant breathed but died immediately before swallowing air, or if the organs are heavily congested/diseased. * **Wredin’s Test:** Another life test involving the **middle ear** (disappearance of the gelatinous cushion).

Question 50: The Narcotics Drugs and Psychotropic Substances Act is applied to all of the following except –

A. Nicotine (Correct Answer)
B. Cocaine
C. Heroin
D. Opioids

Explanation: ### Explanation **Correct Answer: A. Nicotine** The **Narcotic Drugs and Psychotropic Substances (NDPS) Act, 1985**, was enacted to control and regulate operations relating to narcotic drugs and psychotropic substances. **Why Nicotine is the correct answer:** Nicotine is classified as a stimulant and is the primary addictive substance in tobacco. However, it is **not** regulated under the NDPS Act. Instead, tobacco and nicotine products are governed by the **COTPA (Cigarettes and Other Tobacco Products Act), 2003**. While nicotine is toxic in high doses, it does not fall under the legal definition of a "narcotic" or "psychotropic" substance as defined by the 1985 Act. **Analysis of Incorrect Options:** * **B. Cocaine:** Derived from the Coca leaf, it is a potent stimulant specifically listed under the NDPS Act. Possession or sale carries heavy legal penalties. * **C. Heroin:** Also known as Diacetylmorphine, it is a semi-synthetic opioid derived from morphine. It is one of the most strictly regulated substances under the NDPS Act. * **D. Opioids:** This category includes natural opiates (like Morphine and Codeine) and synthetic opioids. These are the primary substances the NDPS Act was designed to regulate due to their high potential for abuse and dependence. **High-Yield Clinical Pearls for NEET-PG:** * **NDPS Act (1985):** Came into force on 14th November 1985. It prohibits the cultivation, manufacture, sale, and consumption of scheduled drugs except for medical/scientific purposes. * **Punishment:** The Act is known for its stringent penalties, which are based on the **quantity** of the drug seized (Small Quantity vs. Commercial Quantity). * **Section 27:** Deals with punishment for the consumption of any narcotic drug or psychotropic substance. * **Section 31A:** Previously allowed for the death penalty for repeat offenders in specific cases (though judicial trends have shifted towards life imprisonment).

Practice by Chapter

Objectives of Medicolegal Autopsy

Practice Questions

Autopsy Procedures

Practice Questions

External Examination

Practice Questions

Internal Examination

Practice Questions

Special Autopsy Techniques

Practice Questions

Organ Retention and Disposal

Practice Questions

Collection of Toxicological Samples

Practice Questions

Autopsy Report Writing

Practice Questions

Histopathology in Autopsies

Practice Questions

Microbiology in Autopsies

Practice Questions

Radiology in Autopsies

Practice Questions

Limitations and Artifacts

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free