Empty light bulb sign (brain death)

Empty light
bulb sign (brain death) • Brain death - Ganzer Fall bei Radiopaedia

Empty light
bulb sign (brain death) • Empty light bulb sign - Ganzer Fall bei Radiopaedia

Empty light
bulb sign (brain death) • Cystic glioblastoma - Ganzer Fall bei Radiopaedia

In brain death, on Tc-99m HMPAO 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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