Injuries and Their Significance — MCQs

Injuries and Their Significance Indian Medical PG Practice Questions and MCQs

Question 511: What does the following image show?

A. Comminuted fracture
B. Pond fracture (Correct Answer)
C. Gutter fracture
D. Craniotabes

Explanation: ***Pond fracture*** - The image shows a **Pond fracture**, a specific type of depressed skull fracture seen in infants. It is characterized by an **inward depression** of the bone without a complete break or separation of fragments, resembling an indentation or "pond." - This fracture usually results from a relatively low-energy impact on the pliable skull of an infant, where the bone bends rather than shatters. *Comminuted fracture* - A **comminuted fracture** involves the bone breaking into **multiple fragments** or pieces. - The image does not show multiple bone fragments; instead, it displays a single, localized indentation. *Gutter fracture* - A **gutter fracture** is a type of **depressed skull fracture** where an elongated, trough-like piece of bone is driven inwards. - While it is a form of depressed fracture, the characteristic shape in the image is more rounded and localized, fitting the description of a pond fracture better than a gutter fracture. *Craniotabes* - **Craniotabes** refers to a condition where areas of the skull bones, particularly in infants, are abnormally thin and soft. - This condition is typically detected by palpation, where the skull feels like a "ping-pong ball," and it is not a fracture but rather a result of incomplete ossification or bone demineralization, often associated with rickets.

Question 512: The following image shows a victim of a firearm injury. What is the suspected distance of the shot?

A. Close range
B. Intermediate range (Correct Answer)
C. Point blank range
D. Distant shot

Explanation: ***Intermediate range*** - The image distinctly shows **stippling** (or tattooing), which consists of multiple small abrasions caused by **unburnt powder grains** impacting the skin. This pattern is characteristic of a shot fired from an intermediate range, typically 15 cm to 1 meter (6 inches to 3 feet). - The absence of a large **soot deposition** (fouling) and the presence of scattered powder grains confirm that the firearm was not fired at a very close or contact range. *Close range* - A close-range shot, usually within 10-15 cm (4-6 inches), would typically show **fouling** (blackening by soot) around the wound, in addition to minimal stippling. - The image does not display the extensive blackening or prominent soot deposition expected from a close-range shot. *Point blank range* - A point-blank (contact) shot implies the muzzle of the firearm was in direct contact with the skin, resulting in an **imprint of the muzzle** and significant **soot and gas forcefully driven into the wound track**. - Such shots often produce a stellate (star-shaped) wound due to gas expansion, and lack the widespread scattered stippling observed in the image because powder is deposited within the wound. *Distant shot* - A distant shot, typically beyond 1-1.5 meters (3-5 feet), would show **neither fouling nor stippling**. - Only the bullet perforates the skin, leaving a simple entrance wound without any surrounding marks from powder or gases.

Question 513: The following patient has which type of injury on the face? (Recent NEET Pattern 2016-17)

A. Laceration (Correct Answer)
B. Abrasion
C. Incised wound
D. Chop wound

Explanation: ***Laceration*** - The image shows an **irregular, deep wound with torn, jagged edges**, consistent with a laceration caused by a blunt force trauma. - Unlike clean incisions, lacerations often have **tissue bridges** and devitalized tissue within the wound. *Abrasion* - An abrasion is a **superficial injury** where the **epidermis is scraped off**, often leaving a raw, weeping surface, which is not what is seen here. - It typically results from friction against a rough surface and does not involve deep tissue tearing. *Incised wound* - An incised wound is caused by a **sharp object**, resulting in **clean, sharp margins** and little tissue damage along the edges. - The wound in the image has irregular, torn edges, which is not characteristic of an incised wound. *Chop wound* - A chop wound results from a heavy, sharp-edged object, combining features of an incised wound and a laceration, often causing **bone damage**. - While deep, the wound in the image lacks the characteristic deep tissue and potential bone involvement typically associated with a chop wound.

Question 514: All are true about the condition shown below except:

A. Coagulation of muscle proteins
B. Can be ante-mortem (Correct Answer)
C. Heat rupture seen
D. Skin slippage

Explanation: ***Can be ante-mortem*** - This is the **INCORRECT** statement. The features shown (pugilistic attitude, heat rupture, and skin slippage) are **post-mortem artifacts** that develop due to the physical effects of heat on a dead body. - While thermal burns themselves can occur ante-mortem (when a person is burned alive), the specific constellation of findings shown - including pugilistic attitude, heat rupture, and skin slippage - are **characteristic post-mortem changes** that occur regardless of whether burning happened before or after death. - Importantly, **these features do NOT reliably distinguish ante-mortem from post-mortem burns**. They are thermal effects on tissues, not vital reactions. - The statement "can be ante-mortem" is misleading because it suggests these post-mortem artifacts indicate ante-mortem injury, which is forensically incorrect. *Coagulation of muscle proteins* - **TRUE statement.** Heat causes denaturation and coagulation of muscle proteins (primarily myosin and actin). - This protein coagulation leads to muscle shortening and contraction, resulting in the characteristic **pugilistic attitude** (boxer's pose). - The muscles contract due to heat-induced shortening, pulling limbs into flexion. *Heat rupture seen* - **TRUE statement.** Heat rupture refers to longitudinal splitting of the skin and deeper tissues. - Occurs due to internal steam pressure and expansion of gases and body fluids when exposed to intense heat. - Results in deep fissures or cracks in the skin, commonly seen in severely burned bodies. - This is a post-mortem artifact of thermal exposure. *Skin slippage* - **TRUE statement.** Skin slippage (heat-induced epidermal separation) occurs when the epidermis separates from the dermis due to heat effects. - Also called "heat vesication" when fluid accumulates between layers. - Results in the outer layers of skin peeling away in sheets. - This is distinct from putrefactive skin slippage and occurs due to thermal damage to the dermal-epidermal junction.

Question 515: The following appearance of skin is seen in case of:

A. Drowning
B. Neck ligature
C. High voltage electric burns (Correct Answer)
D. High temperature water burns

Explanation: ***High voltage electric burns*** - The image shows **"crocodile skin"** or **"lichtenberg figures"**, which are characteristic patterns of skin damage due to the rapid discharge of **high-voltage electricity** through capillaries. - These are pathognomonic for **high-voltage electrical injuries** and result from arborescent patterns of superficial hemorrhage or skin charring. *Drowning* - Drowning typically leads to findings such as **foam in the airways**, **pulmonary edema**, and if prolonged immersion, **washerwoman's skin** (wrinkling) on hands and feet. - The skin appearance in the image does not correlate with the typical post-mortem findings of drowning. *Neck ligature* - Neck ligature injuries result from compression of the neck, leading to a **ligature mark** or furrow on the neck, often associated with petechiae above the constriction. - The pattern seen in the image is not a ligature mark and is inconsistent with neck compression. *High temperature water burns* - High-temperature water burns (scalds) usually produce **blistering**, erythema, or deeper tissue necrosis depending on temperature and exposure time. - While burns can cause skin changes, the specific **arborescent pattern** displayed in the image is not typical of hot water scalds.

Question 516: The following image shows: (AIIMS Nov 2018)

A. Abrasion (Correct Answer)
B. Imprint
C. Laceration
D. Contusion

Explanation: ***Abrasion*** - An **abrasion** is a type of wound caused by the skin rubbing or scraping against a rough surface, resulting in the **removal of the superficial layers of the epidermis**. - The image shows a reddened, raw, and sometimes bleeding area where the top layer of skin has been scraped off, which is characteristic of an abrasion. *Imprint* - An **imprint injury** typically refers to a mark left on the skin by an object that has pressed or struck it, leaving a discernible pattern or shape. - The image does not show a distinct pattern or shape indicative of an object pressing against the skin, but rather a diffuse superficial skin loss. *Laceration* - A **laceration** is a deep cut or tear in the skin or flesh, often with irregular edges, caused by a forceful impact or trauma. - The injury in the image is superficial and does not appear to be a deep cut or tear through the skin layers. *Contusion* - A **contusion**, or bruise, is caused by trauma to blood vessels under the skin, resulting in blood leaking into surrounding tissues. - While there might be some underlying bruising, the primary visible injury is the **surface skin loss and raw appearance**, which is not characteristic of a simple contusion.

Question 517: Based on the image provided, identify the range of fire.

A. Close range (Correct Answer)
B. Distant range
C. Contact
D. Cannot be predicted

Explanation: ***Close range*** - The image clearly shows **tattooing** (unburnt gunpowder particles embedded in the skin) and **scorching/singeing** around the wound entrance, which are pathognomonic features of close-range gunshot wounds. - Close-range wounds occur when the firearm is discharged from **6 inches to 2 feet** away, allowing hot gases and powder particles to reach the skin but without creating a muzzle imprint. *Distant range* - Distant range wounds (beyond 2-3 feet) show **no tattooing or scorching** as the gunpowder particles lose velocity and hot gases cool down before reaching the target. - The wound would appear as a simple **punched-out hole** without surrounding debris, which is clearly not the case in this image. *Contact* - Contact wounds are characterized by a **muzzle imprint**, **star-shaped laceration** from gas expansion, and **absence of surface tattooing** as all residue enters the wound tract. - The image lacks the typical **cruciate tears** and **cherry-red discoloration** from carbon monoxide that are seen in contact wounds. *Cannot be predicted* - The visible **tattooing pattern** and **scorching** provide clear forensic evidence that allows definitive range determination according to **Reddy's Forensic Medicine** principles. - The combination of these specific findings makes range assessment not only possible but straightforward, contradicting the notion that it cannot be predicted.

Question 518: Identify the pattern of abrasion shown in the image below.

A. Pressure abrasion
B. Ligature mark (Correct Answer)
C. Graze abrasion
D. Imprint abrasion

Explanation: ***Ligature mark*** - The image clearly displays a **linear impression** on the neck, consistent with a **ligature mark**, which is an abrasion caused by a constricting object. - This type of abrasion is often seen in cases of **strangulation or hanging**, where a cord or similar item tightens around the neck. *Pressure abrasion* - Pressure abrasions are typically caused by **blunt forceful contact** with a surface, resulting in a scraped or grazed appearance, which differs from the distinct linear mark shown. - They are usually broad and irregular, not forming a clear, thin line as seen in the image. *Graze abrasion* - Graze abrasions, also known as scrapes, involve the **superficial removal of the epidermis** due to friction against a rough surface. - They tend to be spread out and irregular, lacking the deep, circumscribed linear pattern characteristic of a ligature mark. *Imprint abrasion* - Imprint abrasions reflect the **exact pattern of the impacting object** (e.g., tire track, weapon pattern), which is not evident in the image. - While a ligature itself can leave an imprint, the term "imprint abrasion" is usually reserved for more complex patterns than a simple linear groove.

Question 519: Match the following weapons with their corresponding injury types: Weapons: A. Axe B. RTA (Road Traffic Accident) C. Blade D. Lathi Injury Types: 5. Incised wound 6. Tram track bruise 7. Grazed abrasion 8. Chop wound

A. A-5, B-6, C-8, D-7
B. A-6, B-8, C-7, D-5
C. A-8, B-7, C-5, D-6 (Correct Answer)
D. A-7, B-5, C-6, D-8

Explanation: ***A-8 (Axe - Chop wound), B-7 (RTA - Grazed abrasion), C-5 (Blade - Incised wound), D-6 (Lathi - Tram track bruise)*** - An **axe** is a heavy cutting tool that typically causes a **chop wound**, characterized by a combination of cutting and crushing. - A **Road Traffic Accident (RTA)** frequently results in **grazed abrasions** due to friction and shearing forces as the body slides against rough surfaces. - A **blade** (like a knife or razor) is designed to cut, producing an **incised wound** with clean, sharp edges. - A **lathi** (a heavy stick or baton) delivers blunt force trauma, often causing a **tram track bruise** due to the skin being crushed between the impactor and underlying bone, leading to parallel lines of bruising. *A-5, B-6, C-8, D-7* - This option incorrectly associates an **axe** with an **incised wound** (which is caused by a blade) and a **blade** with a **chop wound** (caused by an axe). - It also misattributes **RTA** to a **tram track bruise** and a **lathi** to a **grazed abrasion**, which are not the most typical injury patterns for these respective weapons/mechanisms. *A-6, B-8, C-7, D-5* - This pairing mistakenly links an **axe** with a **tram track bruise** and a **blade** with a **grazed abrasion**. - It also incorrectly associates an **RTA** with a **chop wound** and a **lathi** with an **incised wound**. *A-7, B-5, C-6, D-8* - This option incorrectly matches an **axe** with a **grazed abrasion** and a **lathi** with a **chop wound**. - It also inaccurately connects an **RTA** with an **incised wound** and a **blade** with a **tram track bruise**.

Question 520: During the examination of a gunshot wound, the forensic pathologist notes an entrance wound with abrasion collar and soot deposition. The wound shows a stellate-shaped pattern with irregular margins. This pattern most likely indicates which of the following?

A. Ricochet injury
B. Long-range firing
C. Intermediate-range firing
D. Contact wound (Correct Answer)

Explanation: ***Contact wound*** - A **stellate-shaped pattern with irregular margins** is the pathognomonic feature of a **contact wound** where the muzzle is pressed directly against the skin. - When the weapon is fired in contact with skin, **hot gases expand beneath the skin surface**, causing it to burst outward in a characteristic **stellate or cruciate laceration pattern**. - The presence of **soot deposition** and **abrasion collar** further supports a contact or near-contact gunshot wound. - In contact wounds over bone (e.g., skull), the stellate pattern is most pronounced due to resistance from underlying bone. *Intermediate-range firing* - **Intermediate-range firing** (typically 6 inches to 3 feet) shows **powder tattooing** (stippling) and may show soot deposition around a round or oval entrance wound. - However, intermediate-range wounds do **NOT produce stellate-shaped patterns** because the gases disperse before impact and don't expand beneath the skin. - The entrance wound remains relatively round with surrounding powder stippling. *Ricochet injury* - A **ricochet injury** has an irregular, asymmetrical entrance wound due to bullet deformation and altered trajectory after striking another surface. - Would not show the characteristic stellate pattern or typical soot distribution of direct firing. *Long-range firing* - **Long-range firing** produces only a clean entrance wound with an **abrasion collar**, without soot or powder tattooing. - The distance is too great for combustion byproducts to reach the target. - The wound is typically round or oval without stellate laceration.

Practice by Chapter

Mechanical Injuries

Practice Questions

Transportation Injuries

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Fall from Height

Practice Questions

Blunt Force Trauma

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Sharp Force Trauma

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Ballistic Injuries

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Burn Injuries

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Drowning

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Electrocution

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Lightning Injuries

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Explosion Injuries

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Pattern Injuries and Their Recognition

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