Figure 3From: Invasive pulmonary aspergillosis 10 years post bone marrow transplantation: a case report October 2005 (CT Thorax): Resolution of areas of consolidation and "signet ring sign". The signet ring sign is a finding seen on CT scans of the thorax. It consists of a small circle of soft tissue attenuation that abuts a ring of soft tissue attenuation surrounding a larger low attenuating circle of air and is indicative of bronchiectasis.Back to article page