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A body in water — drowning findings and immersion changes
The autopsy diagnosis of drowning is one of support and exclusion: no single finding proves it, and signs that fit drowning in life — froth in the airways, overinflated lungs and fluid in the sinuses — must be distinguished from changes that every body in water develops.
Why it matters in the exam
Questions ask the student to identify a finding that supports drowning and to separate it from immersion changes. The most prominent supporting finding is fine, white, persistent froth from the mouth and nose and in the trachea, formed by mixing of water, air and surfactant during breathing; it disappears with decomposition. Heavy, overinflated lungs that fill the chest (emphysema aquosum), fluid in the sphenoid sinus, water in the stomach and pale subpleural haemorrhages (Paltauf) also support it, but none is specific on its own.
Diatom testing — microscopic algae — in bone marrow or kidney, compared with diatoms in a water sample from the site, can support that the deceased inhaled water while the heart was still beating; but the test is controversial because of contamination and variation between water sources. In drowning in warm, clean water, as in a bath, findings are especially sparse, so disease, seizure, intoxication and injury must be excluded. Pink teeth are seen in bodies whose head lay low, including in drowning.
Immersion changes do not indicate drowning: wrinkling and whitening of the palms and soles (washerwoman change), beginning within hours and progressing to "glove-like" skin slippage after days; postmortem injuries from stones, rocks, animals and propellers; and later adipocere. In cold water the body sinks and cools quickly and decomposition slows; putrefactive gases bring it to the surface after days. A body put into water after death will show no froth or overinflated lungs, and if it bears wounds with vital reaction, they preceded the immersion.
Key points
- Drowning is a diagnosis of support and exclusion.
- Persistent white froth, overinflated lungs and sinus fluid support it.
- Diatoms — a controversial ancillary test.
- Wrinkling, skin slippage and postmortem wounds are immersion changes.
- Exclude disease, seizure, intoxication and injury.
Summary table
| Finding | Type | Value | Pitfall |
|---|---|---|---|
| Fine white persistent froth | Supports drowning | High in a fresh body | Disappears with decomposition |
| Overinflated heavy lungs, sinus fluid | Supports drowning | Moderate | Not specific alone |
| Diatoms in bone marrow or kidney | Supports drowning | Controversial | Contamination, variation between waters |
| Wrinkled white palms and soles | Immersion change | Shows time in water | Does not prove drowning |
| Postmortem wounds | Immersion change | No vital reaction | Reading them as assault |
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Sources
- Knight's Forensic Pathology, 4th edition (2016) — Immersion deaths
- Spitz and Fisher's Medicolegal Investigation of Death, 5th edition (2020) — Drowning
- Lunetta P, Modell JH. Macroscopical, microscopical and laboratory findings in drowning victims, Forensic Pathology Reviews, 2005 — Diagnostic value of findings
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-06. The text may contain errors; when in doubt, check the source.