Injuries and Their Significance — MCQs

Injuries and Their Significance Indian Medical PG Practice Questions and MCQs

Question 501: The image shows:

A. Stretch laceration
B. Split laceration (Correct Answer)
C. Tear laceration
D. Crush laceration

Explanation: ***Split laceration*** - This is characterized by a wound where skin and subcutaneous tissue are split open due to **crushing forces** between two hard objects, often seen over bony prominences - The edges are typically straight, as if incised, and there may be **bruising** or abrasion around the wound - This is the characteristic appearance shown in the image *Stretch laceration* - This type of laceration occurs when the skin is **stretched beyond its elastic limit**, often seen in degloving injuries or avulsions - It usually results in **irregular, undermined edges** and significant tissue loss, which is not evident in the image *Tear laceration* - A tear laceration results from a forceful **tearing or ripping** of the skin and underlying tissues, often caused by a sharp object moving across the skin - These wounds tend to have **irregular, jagged edges** and often involve bridging strands of tissue that are visible across the wound gap *Crush laceration* - While crushing forces can cause split lacerations, a crush laceration specifically refers to injuries causing **extensive tissue damage**, often with crushing of underlying structures like bone or muscle - The wound itself might be less distinct or irregular, with widespread contusion and tissue non-viability

Question 502: All are correct about the abrasion shown except:

A. Pale parchment
B. Absence of inflammation (Correct Answer)
C. Occurs on bony prominence
D. Presence of vital reaction

Explanation: **This is an EXCEPT question - we need to identify the INCORRECT statement about abrasions.** ***Correct Answer: Absence of inflammation*** - This statement is **INCORRECT** about abrasions, making it the right answer to this EXCEPT question. - Abrasions in living individuals **DO show inflammation** as part of the body's physiological response to injury. - The inflammatory response includes **redness, swelling, pain, heat, and cellular infiltration**, which are hallmarks of vital reaction. - **Absence of inflammation** would suggest a **postmortem abrasion** (injury after death), not an ante-mortem injury. *Incorrect: Pale parchment* - This statement is TRUE about abrasions, so it's not the answer to this EXCEPT question. - The **pale parchment** or dried, leathery appearance is characteristic of abrasions after desiccation. - Results from loss of superficial skin layers and exposure of dermis. *Incorrect: Occurs on bony prominence* - This statement is TRUE about abrasions, so it's not the answer to this EXCEPT question. - Abrasions commonly occur over **bony prominences** (knees, elbows, forehead, chin) due to less soft tissue padding. - These areas are more susceptible to friction and shearing forces during impacts or falls. *Incorrect: Presence of vital reaction* - This statement is TRUE about abrasions, so it's not the answer to this EXCEPT question. - **Vital reaction** refers to physiological responses indicating the injury occurred while the person was alive. - Includes **inflammation, hemorrhage, blood coagulation, cellular infiltration**, and early tissue repair. - Presence of vital reaction confirms ante-mortem injury.

Question 503: The image shows presence of:

A. Postmortem abrasion
B. Contused abrasion (Correct Answer)
C. Imprint abrasion
D. Graze abrasion

Explanation: ***Contused abrasion*** - This image displays a large area of superficial skin injury with underlying **hemorrhage** and tissue discoloration, which are classic features of a **contused abrasion**. - A contused abrasion occurs when there is both **grazing/scraping** of the epidermis and an impact that causes bruising of the underlying dermis. *Postmortem abrasion* - **Postmortem abrasions** typically lack vital reactions such as hemorrhage and inflammation, appearing dry and parchment-like. - The presence of clear redness and probable bleeding in the image indicates a **vital injury**, ruling out postmortem changes. *Imprint abrasion* - An **imprint abrasion** (also known as a pattern abrasion) reproduces the pattern of the object that caused it. - The injury shown is diffuse and irregular, not reflecting a distinct pattern of an object. *Graze abrasion* - A **graze abrasion** (or scrape) is a superficial injury where only the epidermis is removed by friction or scraping. - While there is epidermal involvement, the extensive discoloration and deeper impact evident in the image suggest injury beyond a simple graze, indicating underlying contusion.

Question 504: What type of abrasion is shown in the image?

A. Postmortem abrasion
B. Contused abrasion
C. Imprint abrasion (Correct Answer)
D. Graze abrasion

Explanation: ***Imprint abrasion*** - The image shows multiple distinct, rectangular areas where the epidermis has been scraped away, caused by **direct pressure from an object with a recognizable pattern or surface texture** - **Imprint abrasions** occur when a rough object presses firmly against the skin, leaving a pattern that reflects the object's shape or texture - The visible blood and fresh appearance indicate this is a **vital reaction** (perimortem or antemortem injury) *Postmortem abrasion* - **Postmortem abrasions** are typically caused by handling or dragging of the body after death, appearing as irregular scrapes without significant vital reaction - The abraded areas show visible blood and fresh appearance, indicating **vital reaction** inconsistent with postmortem injury *Contused abrasion* - A **contused abrasion** combines skin scraping with underlying contusion (bruising), indicating stronger blunt force - While underlying bruising might be present, the most prominent feature is the **patterned removal of superficial skin layer** with distinct rectangular shapes characteristic of imprint abrasion *Graze abrasion* - A **graze abrasion** occurs when an object slides across the skin in a tangential direction, removing epidermis in a linear or broad irregular pattern - The distinct **rectangular shapes** are inconsistent with sliding force, which typically produces less organized, more linear patterns

Question 505: What type of injury is shown in the image?

A. Postmortem abrasion
B. Brush burn (Correct Answer)
C. Imprint abrasion
D. Graze abrasion

Explanation: ***Brush burn*** - A **brush burn** is a type of **abrasion** that results from scraping against a rough surface, often seen in falls or motor vehicle accidents, commonly called a "road rash". - The image shows a large, irregular, superficial skin injury where the **epidermis** has been scraped away, consistent with the appearance of a brush burn. *Postmortem abrasion* - **Postmortem abrasions** occur after death, often due to movement of the body or contact with surfaces. - They lack the signs of vitality (e.g., inflammation, bleeding into the tissues) seen in antemortem injuries. *Imprint abrasion* - An **imprint abrasion** occurs when a patterned object presses against and scrapes the skin, leaving a reproduction of its surface pattern. - The injury in the image is **diffuse and irregular**, not exhibiting a distinct pattern from a specific object. *Graze abrasion* - A **graze abrasion** is a superficial abrasion where the top layers of the skin are scraped off, usually in a linear fashion, often due to friction. - While a brush burn is a type of extensive graze, the term "brush burn" more accurately describes the **broad, irregular pattern** of injury shown in the image, often from sliding contact over a large area, as opposed to a simple linear graze.

Question 506: Identify the marks seen on the chest of the patient:

A. Lacerations
B. Incised wound
C. Grazed abrasion (Correct Answer)
D. Contusion

Explanation: ***Grazed abrasion*** - The image shows **superficial injury patterns** across the skin, characterized by broad, irregular areas where the topmost layer of skin (epidermis) has been scraped away. - These patterns are consistent with a **graze**, which is a type of abrasion caused by contact with a rough surface, often leaving streaks or widespread removal of the epidermis. *Lacerations* - **Lacerations** are tears in the skin and underlying tissues typically caused by blunt force, resulting in irregular, jagged wound margins. - The injuries in the image do not show the deep tissue tears or distinct jagged edges characteristic of lacerations. *Incised wound* - An **incised wound** is a clean-cut injury with sharp, regular edges, typically caused by a sharp object like a knife. - The lesion in the image lacks the precise, linear, and deep cuts that define an incised wound. *Contusion* - A **contusion**, or bruise, is caused by trauma that damages capillaries, leading to blood leakage into the interstitial tissues without breaking the skin. - While there might be some underlying bruising, the predominant feature in the image is the visible removal of the superficial skin layers, which is not characteristic of a simple contusion.

Question 507: The following dead body shows presence of:

A. Patterned contusions (Correct Answer)
B. Graze abrasions
C. Brush Burn
D. Linear abrasions

Explanation: ***Patterned contusions*** - The image clearly displays multiple **linear and curvilinear marks** on the torso, which correspond in shape and arrangement to potential external objects or mechanisms. - **Patterned contusions** occur when a blunt object, often with a distinct shape (e.g., a stick, belt, or tire tread), impacts the skin, leaving a bruise that reflects the object's form. *Graze abrasions* - **Graze abrasions** are superficial injuries where the skin is scraped or rubbed rather than impacted, typically appearing as a broad, shallow area of epidermal loss. - These are characterized by the removal of the superficial layers of the skin, often leaving a raw, red, or oozing surface, which is not primarily seen here. *Brush Burn* - A **brush burn** is a type of abrasion caused by skin rubbing violently against a rough surface, typically covering a wide area and causing superficial exfoliation or denudation. - While it is a form of abrasion, the injuries in the image show distinct linear patterns indicating impact rather than widespread frictional rubbing. *Linear abrasions* - **Linear abrasions** are injuries where the skin is scraped in a straight line, often caused by a sharp-edged object or fingernails. - While some injuries in the image are linear, they appear to be deeper, subdermal hemorrhages (contusions) rather than superficial epidermal scrapes, and many exhibit varying widths and shapes indicating a patterned impact rather than a simple scratch.

Question 508: Which wound is shown below?

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

Explanation: ***Stab injury*** - Stab wounds are typically **deeper than they are wide**, as seen in the image with distinct, relatively small entry points. - They are caused by **sharp, pointed objects** penetrating the skin, leading to clean-cut margins and varying depths. *Abrasion* - An abrasion involves the **scraping away of the superficial layers of the skin**, often appearing as grazed or scraped skin with a raw surface. - It would show a **wider, superficial area of injury** rather than the discrete, penetrating marks seen in the image. *Laceration* - A laceration is a **tear or rip in the skin** caused by blunt force trauma, characterized by irregular or jagged wound edges. - The wounds in the image appear to have cleaner edges, suggesting a **piercing rather than a tearing mechanism**. *Contusion* - A contusion, or **bruise**, is caused by blunt trauma leading to extravasation of blood into the subcutaneous tissues, without breaking the skin. - It would manifest as a discoloration of the skin (**ecchymosis**) rather than an open wound with a visible entry point.

Question 509: The following marks are indicative of:

A. Homicide
B. Accident
C. Suicide (Correct Answer)
D. Burking

Explanation: ***Suicide*** - The image shows **"tentative" or "hesitation" marks**, which are superficial, parallel cuts often made near a deeper, more lethal wound. These are highly indicative of **self-inflicted injury** in suicide attempts. - The location (forearm, often non-dominant side) is a common site for suicide attempts by cutting, reflecting the individual's intention and the nature of self-harm. *Homicide* - **Homicidal wounds** are typically inflicted with greater force and intent to kill, resulting in deeper, more irregular, and often more numerous wounds in defensive or offensive positions. - The pattern of cuts shown with multiple superficial marks is not typical for an intentional deadly attack by another person. *Accident* - **Accidental injuries** usually result from unforeseen events and lack the patterned, deliberate nature of the marks seen in the image. - Accidental cuts are often singular, vary in depth, and are not typically concentrated in parallel lines on the forearm in this manner. *Burking* - **Burking** refers to a method of homicide where an individual is suffocated, often in conjunction with body compression, to prevent signs of injury and mimic natural death. - The marks in the image are clearly cuts and do not relate to the mechanism of death associated with burking.

Question 510: Which injury is shown in the image?

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

Explanation: ***Incised wound*** - An **incised wound** is characterized by a clean, sharp cut, typically deeper than it is wide, with **straight edges** and minimal tissue damage around the wound. The image shows multiple deep, linear cuts on the scalp. - These wounds are often caused by sharp objects like knives or glass, and the **profuse bleeding** depicted is consistent with severed blood vessels from such an injury. *Laceration* - A **laceration** is an irregular tear-like wound caused by blunt force trauma, leading to **jagged edges** and often bridging strands of tissue. - The wounds in the image appear clean-cut and linear, not jagged or torn. *Abrasion* - An **abrasion** involves superficial damage to the epidermis and possibly the upper dermis, resulting from friction against a rough surface. - These wounds are typically not deep and involve scraping rather than cutting of the skin, which is not what is shown in the image. *Contusion* - A **contusion**, or bruise, results from blunt force trauma that causes damage to underlying blood vessels without breaking the skin. - This leads to discoloration from extravasated blood and swelling, but no open wound as seen in the image.

Practice by Chapter

Mechanical Injuries

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Transportation Injuries

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Fall from Height

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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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