Frostbite

Frostbite is a focal tissue injury from exposure to extreme cold temperatures, most commonly involves the fingers and toes. It is most commonly encountered in radiology in a differential for acro-osteolysis.

Tissue injury from frostbite occurs in two ways 1:

  • direct tissue necrosis from freezing
  • indirect tissue injury from inflammatory changes and release of inflammatory mediators

Most common on exposed areas: hands, feet, face, ears. The skin changes texture ("waxy") and may develop bulla if the frostbite is severe. 

May be useful to help determine the degree of injury or presence of secondary injury in patients who present clinically with frostbite.

Conventional radiography
  • acro-osteolysis of the distal phalanx / phalangeal tuft
  • swelling of affected soft tissues
  • it has been reported that the thumb may be relatively spared (patient likely to wrap thumb in palm) 2
Nuclear medicine
  • Tc99m-MDP (bone scan)
    • a two-phase scan may be useful to assess the viability of tissue 3
      • a combination of the perfusional phase and soft tissue phase can help characterize areas of inflammation and areas of ischemia (increased or decreased radiotracer activity, respectively)
MRI
  • limited data suggests that MRI may be a useful modality for demarcating ischemic tissue 4

Clinically, frostbite is classified similarly to burns: 1st-4th degree.

Incautious thawing of the tissue may lead to worsened injury (higher degree burn) from the ensuing inflammatory reaction.

Treatment of hypothermia should be prioritized over frostbite.

  • "frostnip": focal tissue injury without permanent damage
  • "immersion foot": frostbite + immersion in water (a type of "trench foot")
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Article Information

rID: 34053
Synonyms or Alternate Spellings:
  • Frost bite

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