Figure 1. (a) Angioinvasive aspergillosis pneumonia diagnosed on bronchoscopy in a 22-year-old man with acute myeloid leukaemia and prolonged neutropenia following bone marrow transplantation. Chest radiograph shows a cavitating right upper lobe mass and left pleural effusion. (b) High resolution CT of the same patient at the time of 1a, shows an "air-crescent sign" due to cavitation of the pulmonary nodule. This occurred about 3 weeks after the appearance of the nodules and indicates that the neutropenia is recovering.