Rim sign (pulmonary infarction)

Last revised by Frank Gaillard on 25 Apr 2019

The rim sign can be seen in cases of pulmonary infarction on PET-CT with very mild peripheral continuous FDG uptake and the complete absence of central uptake. This is a different appearance to that seen in lung abscesses or necrotic tumors, whereby the peripheral FDG-avidity is marked.

History and etymology

It was first described in 2012 by Michael Soussan, a French nuclear physician at the University of Paris 1.

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