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CT Imaging Findings of Fifteen Cases of Atypical Adenomatous Hyperplasia of the Lung
摘要
PURPOSE. To evaluate the computed tomography (CT) appearances of atypical adenomatous hyperplasia (AAH) of lung. MATERIALS AND METHODS. The medical records, chest CT images and pathological reports of 15 patients with pathologically proven AAH encountered in the past 6 years were retrospectively reviewed. RESULTS. Among all AAH lesions, thirteen lesions were located in the right lung, including six in the lower lobe, six in the upper lobe and one in the middle lobe. Two lesions occurred in left lung, both in lower lobe. No multiplicity of AAH lesions was found. All AAH lesions appeared as round (n = 9), oval (n = 5) or irregular (n = 1) shaped nodules on CT, with the largest dimensions ranged from 0.55 to 1.70 cm (mean: 0.84 ± 3.2 cm). Of 15 lesions, 13 featured pure ground glass nodules (GGNs), and two were part-solid GGNs due to thickened alveolar septa by pathology. The average internal attenuation of the GGNs ranged from -729 to -284 HU (mean: -538 ± 105.7 HU). CONCLUSION. An AAH mainly presents as GGN, but may sometimes appear part-solid due to thickening of alveolar septa.