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?

• A The victim was exposed to freshwater only
• B The drowning occurred in polluted water
• C The body was submerged for more than 2 weeks
• D The victim was alive when submersion occurred (vital reaction confirmed) ✓

Explanation

Diatoms in deep tissues such as bone marrow require a functioning circulation to carry them there; they can only reach these sites if the victim inhaled and aspirated water while alive (vital reaction). Postmortem submersion does not result in diatom transport to bone marrow. The species composition (freshwater vs. saltwater diatoms) is matched against the source water to confirm the drowning site. Finding them in marrow is the gold-standard forensic evidence of antemortem drowning.

Reference: The Essentials of Forensic Medicine and Toxicology (Narayan Reddy), 34th ed.

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Written and medically reviewed by the StethoPrep medical team.