FIGURE 4.

Computed tomography showing various radiological categories in allergic bronchopulmonary aspergillosis (ABPA). The scans are from different patients with ABPA. Lung windows for patients with a) serological ABPA (ABPA-S) and b) ABPA with bronchiectasis (ABPA-B). Both lung and mediastinal windows for patients with c, d) ABPA and mucus plugging (ABPA-MP), e, f) ABPA with high-attenuation mucus (ABPA-HAM) and g, h) ABPA with chronic pleuropulmonary fibrosis (ABPA-CPF). Chevron arrows: cylindrical bronchiectasis; bold arrow: cystic bronchiectasis; arrowheads: mucus plugs; thin arrows: high-attenuation mucus plugs (the attenuation of mucus plugs should be observed in the mediastinal windows).