Pyogenic liver abscess - cluster sign
Updates to Case Attributes
The cluster sign is a finding associated with pyogenic liver abscesses. It is better appreciated on contrastcontrast-enhanced CT and MRI images. The sign describes the coalescence of multiple tiny abscesses into a single larger abscess cavity with peripheral rim enhancement on post-contrast studies, giving a clustered appearance.
-<p>The <a title="Cluster sign" href="/articles/cluster-sign">cluster sign</a> is a finding associated with <a title="Pyogenic liver abscess" href="/articles/hepatic-abscess-1">pyogenic liver abscesses</a>. It is better appreciated on contrast-enhanced CT and MRI images. The sign describes the coalescence of multiple tiny abscesses into a single larger abscess cavity with peripheral rim enhancement on post-contrast studies, giving a clustered appearance. </p>- +<p>The <a href="/articles/cluster-sign">cluster sign</a> is a finding associated with <a href="/articles/hepatic-abscess-1">pyogenic liver abscesses</a>. It is better appreciated on contrast-enhanced CT and MRI images. The sign describes the coalescence of multiple tiny abscesses into a single larger abscess cavity with peripheral rim enhancement on post-contrast studies, giving a clustered appearance. </p>
References changed:
- 1. Jeffrey R, Tolentino C, Chang F, Federle M. CT of Small Pyogenic Hepatic Abscesses: The Cluster Sign. AJR Am J Roentgenol. 1988;151(3):487-489. <a href="https://doi.org/10.2214/ajr.151.3.487">doi:10.2214/ajr.151.3.487</a>
- Jeffrey R, Tolentino C, Chang F, Federle M. CT of Small Pyogenic Hepatic Abscesses: The Cluster Sign. AJR Am J Roentgenol. 1988;151(3):487-489. <a href="https://doi.org/10.2214/ajr.151.3.487">doi:10.2214/ajr.151.3.487</a>
Updates to Link Attributes
Updates to Primarylink Attributes
Updates to Study Attributes
There is a large, well-defined hypodense lesion with septations and cluster sign involving the segments VI and VII in the right lobe of the liver. It measures approximately 9.6 cm x 10 cm x 11 cm. These lesions show peripheral enhancement on the arterial phase that persistpersists in the portal and delayed phase with non-enhancing central areas of diminished attenuation on post-contrast studies. A few enhancing septa are also present in the lesion.
Mild right reactionary pleural effusion.
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