Empty light bulb sign

Case contributed by Dr Abhinav Ranwaka
Nuclear medicine

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 or the hot nose sign.

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Case information

rID: 27842
Published: 23rd Feb 2014
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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