Forensic Pathology — MCQs

Forensic Pathology Indian Medical PG Practice Questions and MCQs

Question 281: Which of the following is not a postmortem change:

A. Livor mortis
B. Atria mortis (Correct Answer)
C. Algor mortis
D. Rigor mortis

Explanation: ***Atria mortis*** - *Atria mortis* is not a recognized postmortem change; it appears to be a **nonsensical or fabricated term**. - **Postmortem changes** are a well-defined set of physical and chemical alterations that occur in a body after death. *Livor mortis* - This is a postmortem change characterized by the **reddish-purple discoloration** of the skin due to the settling of blood in capillaries under gravity. - It occurs after circulation ceases and typically becomes visible within 30 minutes to 2 hours after death. *Algor mortis* - This refers to the **postmortem cooling of the body** until it reaches ambient temperature. - The rate of cooling is influenced by environmental factors and body size, and it is used to estimate the time of death. *Rigor mortis* - This is the **stiffening of muscles** after death due to the depletion of ATP, preventing the separation of actin and myosin filaments. - It usually begins 2-4 hours after death, reaches maximum stiffness at 8-12 hours, and resolves within 24-36 hours due to muscle decomposition.

Question 282: Which one of the tissues putrefies late?

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

Explanation: ***Prostate*** - The **prostate** is a glandular organ that contains a significant amount of **fibrinous connective tissue**, which is less susceptible to rapid decomposition. - Its relatively **acidic internal environment** also contributes to slower bacterial proliferation and, therefore, delayed putrefaction compared to other organs. *Liver* - The **liver** is rich in **parenchymal cells** and blood, making it a good substrate for bacterial growth and enzymatic degradation leading to early putrefaction. - Its metabolic activity continues shortly after death, releasing enzymes that contribute to **autolysis** and subsequent putrefaction. *Brain* - The **brain** has a high **water and lipid content**, which makes it highly susceptible to rapid autolysis, particularly by its own lysosomal enzymes. - It also has a rich blood supply, providing ample nutrients for **anaerobic bacteria**, accelerating decomposition. *Stomach* - The **stomach** contains a high concentration of **digestive enzymes** (e.g., pepsin, hydrochloric acid) which, post-mortem, contribute to rapid autolysis of its own tissues. - The presence of food contents and abundant bacteria within the stomach lumen further accelerates the process of **putrefaction**.

Question 283: Most reliable sign of drowning in decomposed bodies?

A. Diatoms in bone marrow (Correct Answer)
B. Foam in airways
C. Pleural effusion
D. Emphysema aquosum

Explanation: ***Diatoms in bone marrow*** - The presence of **diatoms** (unicellular algae) in the **bone marrow** indicates that the individual was alive and circulatory functions were active during submersion, allowing diatoms from the inhaled water to enter the bloodstream via the alveoli and be disseminated throughout the body. - This finding is particularly reliable in decomposed bodies because **bone marrow** is a relatively protected site, and diatoms are highly resistant to decomposition. *Foam in airways* - **Foam in the airways** (frothy fluid in the trachea and bronchi) is a common sign of drowning but is highly susceptible to post-mortem changes and decomposition, making it unreliable in decomposed bodies. - It can also be found in other conditions, such as **pulmonary edema** or **acute cardiac failure**, further limiting its specificity. *Pleural effusion* - **Pleural effusion** (accumulation of fluid in the pleural cavity) is a non-specific finding that can be caused by various medical conditions, including cardiac failure, renal failure, or infection, not exclusively drowning. - In decomposed bodies, it can be difficult to differentiate true pleural effusion from **putrefactive fluid accumulation** or post-mortem transudation, reducing its reliability as a sign of drowning. *Emphysema aquosum* - **Emphysema aquosum** refers to the overdistension of the lungs due to the inhalation of water causing rupture of alveolar septa, creating a spongy appearance. - While it can be suggestive of drowning, it is often difficult to confirm in a **decomposed state** due to significant post-mortem changes and tissue fragility, which can mimic or obscure this finding.

Question 284: Most accurate method to determine time since death in early post-mortem period?

A. Algor mortis
B. Livor mortis
C. Rigor mortis
D. Potassium in vitreous humor (Correct Answer)

Explanation: **Potassium in vitreous humor** - **Potassium concentration in the vitreous humor** increases at a relatively consistent rate after death, making it one of the most reliable methods for estimating time since death, particularly in the **early post-mortem period**. - The vitreous humor is an isolated compartment, less affected by environmental factors compared to other body parts, leading to more **predictable and stable changes**. *Algor mortis* - Refers to the **cooling of the body** after death, which is highly influenced by environmental factors such as ambient temperature, clothing, and body size. - Its accuracy diminishes rapidly, especially after the first few hours, due to these variable influencing factors. *Livor mortis* - Involves the **gravitational settling of blood** in capillaries, leading to discoloration of the skin. - While it helps determine body position at death and whether the body has been moved, its onset (30 minutes to 2 hours) and fixation (8-12 hours) are too broad for precise time estimation in the early post-mortem period. *Rigor mortis* - Describes the **stiffening of muscles** due to the depletion of adenosine triphosphate (ATP) after death. - Its onset (2-6 hours), progression, and resolution (24-84 hours) are highly variable and affected by factors such as muscle activity before death, temperature, and body build, making it less accurate for precise early time estimation.

Question 285: A person dies 2 hours after head injury. Most reliable indicator of ante-mortem injury?

A. Serotonin level
B. Histological examination (Correct Answer)
C. Cortisol level
D. Histamine level

Explanation: ***Histological examination*** - **Histological examination** of injured tissues provides direct evidence of a vital reaction, such as **inflammatory cell infiltration** and early signs of tissue repair, which can only occur in a living individual. - Changes like **hemorrhage with leukocyte infiltration** or early **fibroblast proliferation** are definitive markers of ante-mortem injury. *Serotonin level* - While **serotonin** levels can be affected by stress and injury, they are not a definitive or reliable indicator of **ante-mortem injury** compared to direct tissue evidence. - Levels can fluctuate due to various factors, including post-mortem changes, making interpretation challenging. *Cortisol level* - **Cortisol** levels reflect a stress response, but these can be elevated immediately before death or in the early post-mortem period, making them **less specific** for distinguishing ante-mortem from post-mortem injury. - The rapid post-mortem changes in hormone levels can also compromise the reliability of these measurements. *Histamine level* - **Histamine** release is part of the inflammatory response, but its increase is **not always specific** to ante-mortem injury as mast cells can degranulate post-mortem. - Unlike histological changes, histamine levels alone do not provide definitive evidence of a **vital reaction** occurring in a living organism.

Question 286: A body found in water shows washerwoman's hands. This suggests:

A. Recent death
B. Drowning
C. Postmortem submersion
D. Prolonged submersion (Correct Answer)

Explanation: ***Prolonged submersion*** - **Washerwoman's hands** (also called washerwoman's skin or cutis anserina) refers to the **wrinkling, whitening, and maceration of the skin** on the hands and feet due to prolonged immersion in water. - This phenomenon typically requires **several hours** (usually 2-3 hours minimum) to develop, indicating a significant duration of time spent in water. - This finding indicates **prolonged submersion** regardless of whether death occurred before or after entering the water. *Recent death* - **Recent death** would not exhibit washerwoman's hands, as these skin changes require an extended period of water immersion and maceration. - The absence of such changes would indicate a shorter postmortem interval in water or very recent submersion. *Drowning* - **Drowning** is the mechanism of death caused by respiratory impairment from submersion in liquid. - The presence of washerwoman's hands does **not confirm drowning** as the cause of death - it only indicates prolonged time in water. - A body can show washerwoman's hands whether the person drowned or was dead before entering the water. *Postmortem submersion* - **Postmortem submersion** means the body entered water after death, but does not specify the duration. - While bodies with postmortem submersion can develop washerwoman's hands if left in water long enough, the term itself is too general. - **Washerwoman's hands specifically indicates prolonged exposure** (the time element), not just the fact of submersion.

Question 287: A person died 24 hours ago. Which postmortem change is most likely?

A. Rigor mortis (Correct Answer)
B. Putrefaction
C. Cadaveric spasm
D. Cooling of body

Explanation: ***Rigor mortis*** - Rigor mortis typically begins 2-6 hours after death, becomes fully established at 12-18 hours, and starts resolving by 24-36 hours - At **24 hours post-mortem**, the body is typically in **established rigor** or just beginning to resolve, making this the most characteristic finding - Occurs due to **ATP depletion**, preventing breakdown of actomyosin cross-bridges, leading to muscle stiffness *Putrefaction* - Putrefaction is a later stage of decomposition caused by bacterial activity - Usually becomes evident after **36-48 hours** in temperate climates, appearing as green discoloration of the abdomen - Significant signs (marbling, bloating) are unlikely to be the predominant change at exactly 24 hours *Cadaveric spasm* - Rare phenomenon of **instantaneous stiffening** at the moment of death, usually due to extreme emotional stress or violent death - Does not develop gradually over time and is distinct from rigor mortis - Not typical or expected in routine deaths *Cooling of body (Algor mortis)* - Begins immediately after death and typically reaches ambient temperature by **12-18 hours** depending on environmental factors - While the body would be cooler at 24 hours, cooling is an early change that would have largely completed by this time - Rigor mortis is the more specific and prominent stage at the 24-hour timeframe

Question 288: In which anatomical area do the earliest signs of rigor mortis typically appear after death?

A. Brain
B. Liver
C. Heart
D. Eyes (Correct Answer)

Explanation: ***Eyes (Eyelids and facial muscles)*** - According to **Nysten's Law**, rigor mortis begins in the smallest muscles first and progresses in a characteristic sequence. - The muscles of the **eyelids (orbicularis oculi)** and **jaw (masseter)** are among the first to undergo rigor mortis, typically within **2-4 hours** post-mortem. - These small muscles have high metabolic activity and limited ATP reserves, leading to earlier onset of rigor mortis. - The classical progression follows: **Eyelids → Face → Jaw → Neck → Upper limbs → Trunk → Lower limbs**. *Brain* - Brain tissue does not experience rigor mortis as it lacks **skeletal muscle** and the contractile proteins (actin and myosin) necessary for this process. - Instead, the brain undergoes **autolysis** (self-digestion by enzymes) and putrefaction. *Liver* - The liver is an internal parenchymal organ without skeletal muscle tissue, so it does not exhibit rigor mortis. - Post-mortem changes in the liver involve **autolysis** due to enzymatic activity and later putrefaction. *Heart* - While cardiac muscle can develop **cadaveric spasm** or myocardial rigor, this occurs as part of the generalized rigor sequence. - **Myocardial rigor** typically appears later than rigor in the small facial and jaw muscles, following the overall temporal progression of rigor mortis.

Question 289: During an autopsy, a forensic pathologist identifies hemorrhages in the strap muscles of the neck. What does this finding suggest?

A. Drowning
B. Strangulation (Correct Answer)
C. Electrocution
D. Hypothermia

Explanation: ***Strangulation*** - Hemorrhages in the **strap muscles** of the neck are a classic finding in cases of manual or ligature **strangulation**, indicating direct trauma and force applied to the neck. - This type of injury results from the compression of blood vessels and soft tissues, leading to rupture and bleeding within the muscles. *Drowning* - While other signs might be present, **hemorrhages in the strap muscles** are not a primary indicator of drowning. - Findings in drowning typically relate to fluid aspiration into the lungs, such as frothy mucus or pulmonary edema. *Electrocution* - **Electrocution** usually leaves distinctive electrical marks at the points of entry and exit of the current, and deep tissue damage along the current's path. - **Strap muscle hemorrhages** are not characteristic findings in cases of electrocution. *Hypothermia* - **Hypothermia** typically results in generalized coldness of the body, and specific tissue damage like **strap muscle hemorrhages** is not associated with it. - Autopsy findings for hypothermia often include findings like **Wischnewski spots** in the stomach or paradoxical undressing, and not neck hemorrhages.

Question 290: A decomposed body is found with a mummified appearance in a dry, hot environment. What post-mortem change is observed?

A. Adipocere formation
B. Putrefaction
C. Mummification (Correct Answer)
D. Skeletonization

Explanation: ***Mummification*** - **Mummification** occurs when a body dries out quickly in a **dry, hot environment**, preventing bacterial decay by removing water crucial for microbial growth and enzyme activity. - This process leads to the preservation of soft tissues, resulting in a **leathery, shrunken appearance** as seen in the described decomposed body. *Adipocere formation* - **Adipocere formation**, or **grave wax**, is a post-mortem change where body fats convert into a waxy substance under **moist, anaerobic conditions**, not dry and hot environments. - It usually occurs in submerged bodies or those in damp soil, and the resulting tissue is typically **greasy or soap-like**, not dry and shrunken. *Putrefaction* - **Putrefaction** is the primary process of decomposition caused by **microorganisms**, leading to the breakdown of tissues and organs. - It involves processes like gas formation, discoloration, and liquefaction of tissues, which is largely inhibited in a **dry, hot environment** that favors mummification. *Skeletonization* - **Skeletonization** is the final stage of decomposition where **all soft tissues have decayed**, leaving only the bones. - While it is a post-mortem change, the body described still has a "mummified appearance," indicating the preservation of soft tissues rather than their complete absence.

Practice by Chapter

Postmortem Changes

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Medicolegal Autopsy

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Death Cause, Mechanism and Manner

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Time Since Death Estimation

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Sudden and Unexpected Deaths

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Injuries and Wound Examination

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Blunt Force Injuries

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Sharp Force Injuries

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Firearm Injuries

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Internal Examination in Autopsy

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Histopathology in Forensic Practice

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Death Certification

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