Atoll sign (liver MRI)
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- updated 1 Jan 2024:
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The atoll sign in hepatic imaging has been described when a liver lesion shows a peripheral rim of high T2 signal intensity with the centre of the lesion appearing isointense to the background of non-cirrhotic liver on T2WI mimicking an atoll. The peripheral rim shows hyperenhancement in the portal venous and delayed phases 2. It is considered a characteristic sign of an inflammatory hepatic adenoma but is only seen in about one-third of cases. It probably represents dilated sinusoids within the periphery of the adenoma.
See also
-<p>The <strong>atoll sign</strong> in hepatic imaging has been described when a liver lesion shows a peripheral rim of high T2 signal intensity with the centre of the lesion appearing isointense to the background of non-cirrhotic liver on T2WI mimicking an atoll. The peripheral rim shows hyperenhancement in the <a title="portal phase" href="/articles/portal-phase">portal venous </a>and delayed phases <sup>2</sup>. It is considered a characteristic sign of an <a href="/articles/inflammatory-hepatic-adenoma">inflammatory hepatic adenoma</a> but is only seen in about one-third of cases. It probably represents dilated sinusoids within the periphery of the adenoma.</p><h4>See also</h4><ul><li><a href="/articles/reversed-halo-sign-lungs">atoll sign - chest</a></li></ul>- +<p>The <strong>atoll sign</strong> in hepatic imaging has been described when a liver lesion shows a peripheral rim of high T2 signal intensity with the centre of the lesion appearing isointense to the background of non-cirrhotic liver on T2WI mimicking an atoll. The peripheral rim shows hyperenhancement in the <a title="portal phase" href="/articles/portal-phase">portal venous </a>and delayed phases <sup>2</sup>. It is considered a characteristic sign of an <a href="/articles/inflammatory-hepatic-adenoma">inflammatory hepatic adenoma</a> but is only seen in about one-third of cases. It probably represents dilated sinusoids within the periphery of the adenoma.</p><h4>See also</h4><ul><li><a href="/articles/atoll-sign-lungs">atoll sign - chest</a></li></ul>
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Image 1 Diagram ( create )
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Figure1: atoll
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Image 2 MRI (T2) ( update )
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