Empty light bulb sign in brain death

In brain death, on HMPAO-Tc99m imaging there is absent or reduced flow in the internal carotid arteries and increased flow within the external carotid arteries. This leads to absent uptake in the brain with subsequent increased perfusion in the nasal region. This appearance has been called the 'empty light bulb' sign 

It has also been described as the hot nose sign.

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Article Information

rID: 27841
Section: Signs
Synonyms or Alternate Spellings:
  • Empty light bulb sign

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