Signal flare phenomenon
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The signal flare phenomenon is a useful sign to identify active bleeding in a liquefied haematoma with haematocrit effect on dynamic CT scan images.
When active arterial haemorrhage is present in a liquefied haematoma haematoma that has a haematocrit effect, a signal flare phenomenon phenomenon may be seen as a linear, high attenuating attenuating focus in the dependent layer as well asas very high high-attenuation foci at the boundary of the two fluid-fluid levels levels.
This is due to movement of very-high attenuation extravasated extravasated contrast material through the dependent cellular layer to the boundary of the cellular and liquid layers, based on differences in specific gravity.
-<p>The <strong style="line-height: 1.5;">signal flare phenomenon</strong> is a useful sign to identify active bleeding in a liquefied haematoma with <a href="/articles/haematocrit-effect" title="haematocrit effect" style="line-height: 1.5;">haematocrit effect</a> on dynamic CT scan images.</p><p>When active arterial haemorrhage is present in a liquefied haematoma that has a <a href="/articles/haematocrit-effect" title="haematocrit effect">haematocrit effect</a>, a signal flare phenomenon may be seen as a linear, high attenuating focus in the dependent layer as well as very high-attenuation foci at the boundary of the two fluid-fluid levels. </p><p>This is due to movement of very-high attenuation extravasated contrast material through the dependent cellular layer to the boundary of the cellular and liquid layers, based on differences in specific gravity.</p>- +<p>The <strong>signal flare phenomenon</strong> is a useful sign to identify active bleeding in a liquefied haematoma with <a href="/articles/haematocrit-effect">haematocrit effect</a> on dynamic CT scan images.</p><p>When active arterial haemorrhage is present in a liquefied haematoma that has a <a href="/articles/haematocrit-effect">haematocrit effect</a>, a signal flare phenomenon may be seen as a linear, high attenuating focus in the dependent layer as well as very high-attenuation foci at the boundary of the two fluid-fluid levels. </p><p>This is due to movement of very-high attenuation extravasated contrast material through the dependent cellular layer to the boundary of the cellular and liquid layers, based on differences in specific gravity.</p>
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