Gangrene

• Necrotic, usually black, tissue due to obstruction, diminution, or loss of blood supply.
• Gangrene may be wet or dry:
  • Wet gangrene often follows a crushing injury. It has an offensive odor and spreads rapidly.
  • Dry gangrene becomes cold, dry, and shriveled and eventually turns black.

  

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  Gangrenous ear secondary to cocaine levamisole toxicity.

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  Palpable purpura and gangrene in warfarin necrosis.

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  Deep purpura and black skin of gangrene in acute meningococcemia.

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  Necrotic gangrenous toes in a patient with bacterial sepsis.