A 10-year-old girl with leukemia and biopsy proven Aspergillus infection of the lung. She later developed a mycotic aneurysm in the chest. (a) CT showed a cavity with a “crescent sign” in keeping with an Aspergilloma. The lesion was excised. (b) Chest radiograph two months later showed a round opacity in the right lung. (c) CT revealed an aneurysm of the lower lobe branch of the right pulmonary artery.

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