Figure 10b. Aspergillus infection in a patient with bilateral lung transplants for cystic fibrosis. Axial high-resolution CT images, obtained more than 8 weeks after lung transplantation, demonstrate dense airspace consolidation of the left lower lobe (a) and bilateral ground-glass nodules (arrows in b) with surrounding halos of decreased attenuation (halo sign). A bronchoalveolar lavage culture was positive for Aspergillus.