Asphyxial Deaths (Mechanical Asphyxia, Drowning, Smothering) MCQs

Forensic Medicine · 40 free questions with answers & explanations.

1. At autopsy of a drowned body, which finding most reliably distinguishes VITAL drowning (ante-mortem) from post-mortem submersion?
2. A ligature mark is found encircling the neck of a deceased. The mark is at the level of the thyroid cartilage, is oblique (upward toward the knot), does not completely encircle the neck, and shows a gap posteriorly. Which manner of death does this pattern indicate?
3. In manual throttling (homicidal strangulation by hand), the thyroid cartilage and hyoid bone are frequently fractured. Which specific fracture pattern of the hyoid is MOST characteristic of throttling rather than hanging?
4. A 6-month-old infant is brought dead to the emergency department. Autopsy reveals bilateral retinal haemorrhages, subdural haematoma in the interhemispheric fissure, and diffuse axonal injury, but NO external head injuries. The MOST likely mechanism responsible for the intracranial findings is:
5. At autopsy of a case of drowning, both lungs are markedly edematous and over-inflated, filling the thoracic cavity on opening the chest ("waterlogged lungs"). The stomach contains turbid water mixed with sand. Diatoms are found in the bone marrow. Which type of drowning does this BEST represent?
6. In hanging, the ligature mark characteristically runs UPWARD toward the point of suspension in a non-continuous oblique manner, leaving a pale furrow with peripheral ecchymoses. In contrast, which feature BEST differentiates strangulation by ligature from hanging?
7. A postmortem examination of a 4-month-old infant shows bilateral retinal haemorrhages, subdural haematoma, and rib fractures at different stages of healing with no external evidence of impact. No ligature marks or external neck injuries are found. The cause of death is most likely:
8. At autopsy of a drowning victim, diatoms are recovered from the bone marrow of the femur. What is the MOST significant implication of this finding?
9. In a case of ligature strangulation, the ligature mark is found to be oblique, non-continuous and situated high up on the neck, above the thyroid cartilage. There is a triangular pale area in the cervical region. These features MOST suggest:
10. A body is found with foam in the mouth and nostrils, waterlogged lungs (each weighing >700 g), and emphysema aquosum. Microscopically, alveoli are overdistended with pale material and foreign particles. Which ADDITIONAL autopsy finding would BEST support freshwater rather than saltwater drowning?
11. In smothering, postmortem findings are predominantly non-specific. Which of the following represents a finding SPECIFIC to smothering rather than being common to all asphyxial deaths?
12. A body is retrieved from a canal. At autopsy, the lungs are ballooned and crepitant, water and weeds are found in the airways, and diatoms are detected in the femoral bone marrow on acid digestion. The most forensically significant finding distinguishing ante-mortem drowning from post-mortem submersion is:
13. In fresh-water drowning, the sequence of haematological changes differs from salt-water drowning because:
14. In hanging, the classical sign 'Tardieu spots' are best described as:
15. A 40-year-old man is found dead with a ligature mark on the neck. The mark is pale, parchmentised, oblique, ascending towards a suspension point behind the left ear, with a gap at the apex (knot position). The finding at autopsy of fracture of the hyoid bone and thyroid cartilage would indicate:
16. In throttling (manual strangulation), the pattern of hyoid fracture differs from ligature strangulation because:
17. In a case of strangulation by ligature, the ligature mark shows a pale, parchment-like groove without much bruising and ecchymosis in the surrounding skin. This finding MOST likely indicates:
18. The diatom test (Incinerator-acid digestion test) in suspected drowning cases is considered positive for antemortem drowning when diatoms are found in which organ?
19. In hanging deaths, the atypical (incomplete, partial) hanging differs from typical hanging in which histological feature of the internal neck structures?
20. Positional asphyxia (postural asphyxia) is seen in all of the following situations EXCEPT:
21. Café coronary syndrome refers to sudden death from food bolus impaction at the laryngopharynx. Which vagal reflex mediates the rapid cardiovascular collapse seen in these cases BEFORE hypoxia becomes lethal?
22. In a drowning fatality examined postmortem, which combination of findings MOST strongly supports primary freshwater (not saltwater) drowning?
23. Diatom analysis of bone marrow is used in forensic drowning investigations. The rationale for sampling bone marrow rather than lung tissue is:
24. In a case of throttling (manual strangulation), the pathologist finds bilateral fractures of the superior cornua of the thyroid cartilage. This specific injury pattern is MOST useful for distinguishing throttling from:
25. A body recovered from a river has a spume (froth) from the nose and mouth, cutaneous lividity, waterlogging of the body, and 'washerwoman hands'. Diatom analysis of the bone marrow shows diatoms matching those of the river water. This finding of matching diatoms in bone marrow is MOST significant because:
26. In traumatic asphyxia (crush asphyxia, e.g., crowd crush), the petechial haemorrhages are MOST prominently located in:
27. A body recovered from the sea has a frothy exudate at the mouth, waterlogging of the lungs, and diatoms in the bone marrow aspirated postmortem. The significance of finding identical diatoms in the bone marrow AND the site of recovery water is:
28. In a case of ligature strangulation, the ligature mark is positioned below the thyroid cartilage. Which of the following features MOST reliably distinguishes ante-mortem ligature strangulation from postmortem ligature application?
29. A body is retrieved from water. Autopsy reveals marked cadaveric emphysema, mushroom froth at nostrils and mouth, waterlogged lungs (combined weight > 1,500 g), presence of diatoms in liver and bone marrow, and a stomach containing 300 mL of turbid water. The MOST reliable finding to confirm antemortem drowning (as opposed to postmortem immersion) is:
30. In a case of ligature strangulation (homicide), which autopsy finding distinguishes it from hanging (typically suicidal)?
31. At autopsy of a suspected hanging victim, the ligature mark on the neck is found to be oblique, non-continuous (with a gap at the apex), and situated above the thyroid cartilage. These findings are most consistent with:
32. A 35-year-old man is found dead with petechial haemorrhages in the conjunctivae, cyanosis of the lips and fingertips, and florid petechiae over the face. These findings are LEAST likely in which of the following causes of death?
33. During autopsy of a drowning victim, which of the following is considered the MOST reliable internal finding to confirm ante-mortem drowning?
34. A 5-year-old child is brought dead with petechial haemorrhages on the face, scleral haemorrhages, and bruising around the nose and mouth. No ligature mark is present. The most likely cause of death is:
35. Which fracture of the neck structure is considered MOST pathognomonic of homicidal throttling (manual strangulation)?
36. At autopsy of a victim of suicidal hanging, which of the following is NOT typically found?
37. The most reliable autopsy sign distinguishing antemortem drowning from postmortem submersion is:
38. A body is found with neck petechiae, conjunctival haemorrhages, facial congestion and cyanosis, with finger-shaped bruises on either side of the neck. The cause of death is most likely:
39. Tardieu's spots are subpleural and subepicardial petechiae classically associated with death by:
40. In postmortem examination of a smothering death, the most important autopsy findings are typically located in: